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<!doctype html><html lang=en-us dir=ltr><head><meta charset=utf-8><meta name=viewport content='width=device-width,initial-scale=1'><meta name=description content="Context Many years ago I bought a &ldquo;bargain&rdquo; bluetooth scale. I wanted a way to automatically log my weight, and the Xiaomi equivalent was more than twice as expensive at the time. The problem is that it came with a very basic and somewhat sketchy software that required signing up, and none of the typical apps (openscale, gadgetbridge&mldr;) supported it. I looked at how to reverse engineer it, but I did not have much time back then, and I wrote it off as a &ldquo;future project&rdquo;. Luckily, it had a screen, so I&rsquo;ve been using it as a regular scale. I did not even bother to check the body composition metrics, because I got a very depressing reading of 35% body fat.\n"><title>Installing Micropython on the Super Mini ESP32-S3</title><link rel=canonical href=https://balkian.com/p/installing-micropython-on-the-super-mini-esp32-s3/><link rel=stylesheet href=/scss/style.min.2882a282de220283d6a6763f309d88473c8c934a66d2f8fcb45ce0bfac2af61a.css><meta property='og:title' content="Installing Micropython on the Super Mini ESP32-S3"><meta property='og:description' content="Context Many years ago I bought a &ldquo;bargain&rdquo; bluetooth scale. I wanted a way to automatically log my weight, and the Xiaomi equivalent was more than twice as expensive at the time. The problem is that it came with a very basic and somewhat sketchy software that required signing up, and none of the typical apps (openscale, gadgetbridge&mldr;) supported it. I looked at how to reverse engineer it, but I did not have much time back then, and I wrote it off as a &ldquo;future project&rdquo;. Luckily, it had a screen, so I&rsquo;ve been using it as a regular scale. I did not even bother to check the body composition metrics, because I got a very depressing reading of 35% body fat.\n"><meta property='og:url' content='https://balkian.com/p/installing-micropython-on-the-super-mini-esp32-s3/'><meta property='og:site_name' content='J. Fernando Sánchez'><meta property='og:type' content='article'><meta property='article:section' content='Post'><meta property='article:published_time' content='2025-07-20T02:30:43+02:00'><meta property='article:modified_time' content='2025-07-20T02:30:43+02:00'><meta name=twitter:title content="Installing Micropython on the Super Mini ESP32-S3"><meta name=twitter:description content="Context Many years ago I bought a &ldquo;bargain&rdquo; bluetooth scale. I wanted a way to automatically log my weight, and the Xiaomi equivalent was more than twice as expensive at the time. The problem is that it came with a very basic and somewhat sketchy software that required signing up, and none of the typical apps (openscale, gadgetbridge&mldr;) supported it. I looked at how to reverse engineer it, but I did not have much time back then, and I wrote it off as a &ldquo;future project&rdquo;. Luckily, it had a screen, so I&rsquo;ve been using it as a regular scale. I did not even bother to check the body composition metrics, because I got a very depressing reading of 35% body fat.\n"><link rel="shortcut icon" href=/img/favicon.ico></head><body class=article-page><script>(function(){const e="StackColorScheme";localStorage.getItem(e)||localStorage.setItem(e,"auto")})()</script><script>(function(){const t="StackColorScheme",e=localStorage.getItem(t),n=window.matchMedia("(prefers-color-scheme: dark)").matches===!0;e=="dark"||e==="auto"&&n?document.documentElement.dataset.scheme="dark":document.documentElement.dataset.scheme="light"})()</script><div class="container main-container flex on-phone--column extended"><aside class="sidebar left-sidebar sticky"><button class="hamburger hamburger--spin" type=button id=toggle-menu aria-label="Toggle Menu">
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</a><span class=emoji>💭</span></figure><div class=site-meta><h1 class=site-name><a href=/>J. Fernando Sánchez</a></h1><h2 class=site-description>My ramblings and reflections</h2></div></header><ol class=menu-social><li><a href=https://github.com/CaiJimmy/hugo-theme-stack target=_blank title=GitHub rel=me><svg class="icon icon-tabler icon-tabler-brand-github" width="24" height="24" viewBox="0 0 24 24" stroke-width="2" stroke="currentColor" fill="none" stroke-linecap="round" stroke-linejoin="round"><path stroke="none" d="M0 0h24v24H0z" fill="none"/><path d="M9 19c-4.3 1.4-4.3-2.5-6-3m12 5v-3.5c0-1 .1-1.4-.5-2 2.8-.3 5.5-1.4 5.5-6a4.6 4.6.0 00-1.3-3.2 4.2 4.2.0 00-.1-3.2s-1.1-.3-3.5 1.3a12.3 12.3.0 00-6.2.0C6.5 2.8 5.4 3.1 5.4 3.1a4.2 4.2.0 00-.1 3.2A4.6 4.6.0 004 9.5c0 4.6 2.7 5.7 5.5 6-.6.6-.6 1.2-.5 2V21"/></svg></a></li><li><a href=https://git.sinpapel.es/balkian target=_blank title=gitea rel=me><svg viewBox="0 0 640 640" width="32" height="32"><path d="m395.9 484.2-126.9-61c-12.5-6-17.9-21.2-11.8-33.8l61-126.9c6-12.5 21.2-17.9 33.8-11.8 17.2 8.3 27.1 13 27.1 13l-.1-109.2 16.7-.1.1 117.1s57.4 24.2 83.1 40.1c3.7 2.3 10.2 6.8 12.9 14.4 2.1 6.1 2 13.1-1 19.3l-61 126.9c-6.2 12.7-21.4 18.1-33.9 12" style="fill:#fff"/><path d="M622.7 149.8c-4.1-4.1-9.6-4-9.6-4s-117.2 6.6-177.9 8c-13.3.3-26.5.6-39.6.7v117.2c-5.5-2.6-11.1-5.3-16.6-7.9.0-36.4-.1-109.2-.1-109.2-29 .4-89.2-2.2-89.2-2.2s-141.4-7.1-156.8-8.5c-9.8-.6-22.5-2.1-39 1.5-8.7 1.8-33.5 7.4-53.8 26.9C-4.9 212.4 6.6 276.2 8 285.8c1.7 11.7 6.9 44.2 31.7 72.5 45.8 56.1 144.4 54.8 144.4 54.8s12.1 28.9 30.6 55.5c25 33.1 50.7 58.9 75.7 62 63 0 188.9-.1 188.9-.1s12 .1 28.3-10.3c14-8.5 26.5-23.4 26.5-23.4S547 483 565 451.5c5.5-9.7 10.1-19.1 14.1-28 0 0 55.2-117.1 55.2-231.1-1.1-34.5-9.6-40.6-11.6-42.6M125.6 353.9c-25.9-8.5-36.9-18.7-36.9-18.7S69.6 321.8 60 295.4c-16.5-44.2-1.4-71.2-1.4-71.2s8.4-22.5 38.5-30c13.8-3.7 31-3.1 31-3.1s7.1 59.4 15.7 94.2c7.2 29.2 24.8 77.7 24.8 77.7s-26.1-3.1-43-9.1m300.3 107.6s-6.1 14.5-19.6 15.4c-5.8.4-10.3-1.2-10.3-1.2s-.3-.1-5.3-2.1l-112.9-55s-10.9-5.7-12.8-15.6c-2.2-8.1 2.7-18.1 2.7-18.1L322 273s4.8-9.7 12.2-13c.6-.3 2.3-1 4.5-1.5 8.1-2.1 18 2.8 18 2.8L467.4 315s12.6 5.7 15.3 16.2c1.9 7.4-.5 14-1.8 17.2-6.3 15.4-55 113.1-55 113.1" style="fill:#609926"/><path d="M326.8 380.1c-8.2.1-15.4 5.8-17.3 13.8s2 16.3 9.1 20c7.7 4 17.5 1.8 22.7-5.4 5.1-7.1 4.3-16.9-1.8-23.1l24-49.1c1.5.1 3.7.2 6.2-.5 4.1-.9 7.1-3.6 7.1-3.6 4.2 1.8 8.6 3.8 13.2 6.1 4.8 2.4 9.3 4.9 13.4 7.3.9.5 1.8 1.1 2.8 1.9 1.6 1.3 3.4 3.1 4.7 5.5 1.9 5.5-1.9 14.9-1.9 14.9-2.3 7.6-18.4 40.6-18.4 40.6-8.1-.2-15.3 5-17.7 12.5-2.6 8.1 1.1 17.3 8.9 21.3s17.4 1.7 22.5-5.3c5-6.8 4.6-16.3-1.1-22.6 1.9-3.7 3.7-7.4 5.6-11.3 5-10.4 13.5-30.4 13.5-30.4.9-1.7 5.7-10.3 2.7-21.3-2.5-11.4-12.6-16.7-12.6-16.7-12.2-7.9-29.2-15.2-29.2-15.2s0-4.1-1.1-7.1c-1.1-3.1-2.8-5.1-3.9-6.3 4.7-9.7 9.4-19.3 14.1-29-4.1-2-8.1-4-12.2-6.1-4.8 9.8-9.7 19.7-14.5 29.5-6.7-.1-12.9 3.5-16.1 9.4-3.4 6.3-2.7 14.1 1.9 19.8z" style="fill:#609926"/></svg></a></li><li><a href='https://scholar.google.com/citations?user=JLNusZ8AAAAJ&amp;hl=en' target=_blank title="Google scholar" rel=me><svg aria-label="Google Scholar" role="img" viewBox="0 0 512 512"><rect width="512" height="512" rx="15%" fill="#4285f4"/><path fill="#fff" d="M213 111l-107 94h69c5 45 41 64 78 67-7 18-4 27 7 39-43 1-103 26-103 67 4 45 63 54 92 54 38 1 81-19 90-54 4-35-10-54-31-71-23-18-28-28-21-40 15-17 35-27 39-51 2-17-2-28-6-43l45-38-1 16c-3 2-5 6-5 9v103c2 13 22 11 23 0V160c0-3-2-7-5-8v-25l16-16zm58 141c-61 10-87-87-38-99 56-11 83 86 38 99zm-5 73c60 13 61 63 10 78-44 9-82-4-81-30 0-25 35-48 71-48z"/></svg></a></li></ol><ol class=menu id=main-menu><li><a href=/><svg class="icon icon-tabler icon-tabler-home" width="24" height="24" viewBox="0 0 24 24" stroke-width="2" stroke="currentColor" fill="none" stroke-linecap="round" stroke-linejoin="round"><path stroke="none" d="M0 0h24v24H0z"/><polyline points="5 12 3 12 12 3 21 12 19 12"/><path d="M5 12v7a2 2 0 002 2h10a2 2 0 002-2v-7"/><path d="M9 21v-6a2 2 0 012-2h2a2 2 0 012 2v6"/></svg>
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<span>Dark Mode</span></li></ol></li></ol></aside><aside class="sidebar right-sidebar sticky"><section class="widget archives"><div class=widget-icon><svg class="icon icon-tabler icon-tabler-hash" width="24" height="24" viewBox="0 0 24 24" stroke-width="2" stroke="currentColor" fill="none" stroke-linecap="round" stroke-linejoin="round"><path stroke="none" d="M0 0h24v24H0z"/><line x1="5" y1="9" x2="19" y2="9"/><line x1="5" y1="15" x2="19" y2="15"/><line x1="11" y1="4" x2="7" y2="20"/><line x1="17" y1="4" x2="13" y2="20"/></svg></div><h2 class="widget-title section-title">Table of contents</h2><div class=widget--toc><nav id=TableOfContents><ol><li><a href=#context>Context</a></li><li><a href=#the-problem>The problem</a></li><li><a href=#the-solution>The solution</a></li></ol></nav></div></section></aside><main class="main full-width"><article class=main-article><header class=article-header><div class=article-details><div class=article-title-wrapper><h2 class=article-title><a href=/p/installing-micropython-on-the-super-mini-esp32-s3/>Installing Micropython on the Super Mini ESP32-S3</a></h2></div><footer class=article-time><div><svg class="icon icon-tabler icon-tabler-calendar-time" width="56" height="56" viewBox="0 0 24 24" stroke-width="2" stroke="currentColor" fill="none" stroke-linecap="round" stroke-linejoin="round"><path stroke="none" d="M0 0h24v24H0z"/><path d="M11.795 21H5a2 2 0 01-2-2V7a2 2 0 012-2h12a2 2 0 012 2v4"/><circle cx="18" cy="18" r="4"/><path d="M15 3v4"/><path d="M7 3v4"/><path d="M3 11h16"/><path d="M18 16.496V18l1 1"/></svg>
<time class=article-time--published>20 Jul 2025</time></div><div><svg class="icon icon-tabler icon-tabler-clock" width="24" height="24" viewBox="0 0 24 24" stroke-width="2" stroke="currentColor" fill="none" stroke-linecap="round" stroke-linejoin="round"><path stroke="none" d="M0 0h24v24H0z"/><circle cx="12" cy="12" r="9"/><polyline points="12 7 12 12 15 15"/></svg>
<time class=article-time--reading>3 minute read</time></div></footer></div></header><section class=article-content><h2 id=context>Context</h2><p>Many years ago I bought a &ldquo;bargain&rdquo; bluetooth scale.
I wanted a way to automatically log my weight, and the Xiaomi equivalent was more than twice as expensive at the time.
The problem is that it came with a very basic and somewhat sketchy software that required signing up, and none of the typical apps (openscale, gadgetbridge&mldr;) supported it.
I looked at how to reverse engineer it, but I did not have much time back then, and I wrote it off as a &ldquo;future project&rdquo;.
Luckily, it had a screen, so I&rsquo;ve been using it as a regular scale.
I did not even bother to check the body composition metrics, because I got a very depressing reading of 35% body fat.</p><p>Flash forward to today, when I decided to finally work on it.
In addition to trying nrfConnect, I installed the app to see the actual values..
It turns out the composition data was completely off!!
When a reading starts, the app needs to tell the scale some basic data about you (age, height, sex).
Unfortunately, there is no way (that I know of) to set a default user, so when the phone is not connected, it goes back to the wildly inaccurate reading.</p><p>So, I decided to connect one of my idle ESP32 boards to it, to interface with the scale through bluetooth (sending the right user data) and logging the results somewhere through WiFi.</p><h2 id=the-problem>The problem</h2><p>Installing the firmware was not too difficult, after I got the board to properly register.</p><div class=highlight><div class=chroma><table class=lntable><tr><td class=lntd><pre tabindex=0 class=chroma><code><span class=lnt>1
</span><span class=lnt>2
</span><span class=lnt>3
</span><span class=lnt>4
</span><span class=lnt>5
</span><span class=lnt>6
</span></code></pre></td><td class=lntd><pre tabindex=0 class=chroma><code class=language-gdscript3 data-lang=gdscript3><span class=line><span class=cl><span class=err>❯</span> <span class=n>uv</span> <span class=k>tool</span> <span class=n>run</span> <span class=n>esptool</span><span class=o>.</span><span class=n>py</span> <span class=o>--</span><span class=n>port</span> <span class=o>/</span><span class=n>dev</span><span class=o>/</span><span class=n>ttyACM4</span> <span class=n>erase</span><span class=o>-</span><span class=n>flash</span>
</span></span><span class=line><span class=cl><span class=o>...</span>
</span></span><span class=line><span class=cl><span class=n>Chip</span> <span class=n>type</span><span class=p>:</span> <span class=n>ESP32</span><span class=o>-</span><span class=n>S3</span> <span class=p>(</span><span class=n>QFN56</span><span class=p>)</span> <span class=p>(</span><span class=n>revision</span> <span class=n>v0</span><span class=o>.</span><span class=mi>2</span><span class=p>)</span>
</span></span><span class=line><span class=cl><span class=n>Features</span><span class=p>:</span> <span class=n>Wi</span><span class=o>-</span><span class=n>Fi</span><span class=p>,</span> <span class=n>BT</span> <span class=mi>5</span> <span class=p>(</span><span class=n>LE</span><span class=p>),</span> <span class=n>Dual</span> <span class=n>Core</span> <span class=o>+</span> <span class=n>LP</span> <span class=n>Core</span><span class=p>,</span> <span class=mi>240</span><span class=n>MHz</span><span class=p>,</span> <span class=n>Embedded</span> <span class=n>Flash</span> <span class=mi>4</span><span class=n>MB</span> <span class=p>(</span><span class=n>XMC</span><span class=p>),</span> <span class=n>Embedded</span> <span class=n>PSRAM</span> <span class=mi>2</span><span class=n>MB</span> <span class=p>(</span><span class=n>AP_3v3</span><span class=p>)</span>
</span></span><span class=line><span class=cl><span class=o>...</span>
</span></span><span class=line><span class=cl><span class=err>❯</span> <span class=n>uv</span> <span class=k>tool</span> <span class=n>run</span> <span class=n>esptool</span><span class=o>.</span><span class=n>py</span> <span class=o>--</span><span class=n>port</span> <span class=o>/</span><span class=n>dev</span><span class=o>/</span><span class=n>ttyACM4</span> <span class=o>--</span><span class=n>baud</span> <span class=mi>460800</span> <span class=n>write_flash</span> <span class=mi>0</span> <span class=n>ESP32_GENERIC_S3</span><span class=o>-</span><span class=mi>20250415</span><span class=o>-</span><span class=n>v1</span><span class=o>.</span><span class=mf>25.0</span><span class=o>.</span><span class=n>bin</span>
</span></span></code></pre></td></tr></table></div></div><p>But then, I kept getting this error on boot: <code>OSError: (-24579, 'ESP_ERR_FLASH_NOT_INITIALISED')</code>.
And I could not copy any files or install any packages.</p><p>After some research, I narrowed the possibilities to:</p><ul><li>A wrong partition table, most likely due to the fact that my board only has 4MB of flash.</li><li>Using an unsupported type of PSRAM (less likely)</li></ul><h2 id=the-solution>The solution</h2><p>At this point, I could either try to compile the firmware with a custom partition (kind of tedious), or I could use the wonderful <a class=link href=https://github.com/glenn20/mp-image-tool-esp32 target=_blank rel=noopener>mp-image-tool-esp32</a> tool to check existing firmwares and modify partition sizes.</p><p>I confirmed my suspicion:</p><div class=highlight><div class=chroma><table class=lntable><tr><td class=lntd><pre tabindex=0 class=chroma><code><span class=lnt> 1
</span><span class=lnt> 2
</span><span class=lnt> 3
</span><span class=lnt> 4
</span><span class=lnt> 5
</span><span class=lnt> 6
</span><span class=lnt> 7
</span><span class=lnt> 8
</span><span class=lnt> 9
</span><span class=lnt>10
</span><span class=lnt>11
</span><span class=lnt>12
</span><span class=lnt>13
</span><span class=lnt>14
</span></code></pre></td><td class=lntd><pre tabindex=0 class=chroma><code class=language-gdscript3 data-lang=gdscript3><span class=line><span class=cl><span class=err>❯</span> <span class=n>uv</span> <span class=k>tool</span> <span class=n>run</span> <span class=n>mp</span><span class=o>-</span><span class=n>image</span><span class=o>-</span><span class=k>tool</span><span class=o>-</span><span class=n>esp32</span> <span class=o>~/</span><span class=n>Downloads</span><span class=o>/</span><span class=n>ESP32_GENERIC_S3</span><span class=o>-</span><span class=mi>20250415</span><span class=o>-</span><span class=n>v1</span><span class=o>.</span><span class=mf>25.0</span><span class=o>.</span><span class=n>bin</span>
</span></span><span class=line><span class=cl><span class=n>Running</span> <span class=n>mp</span><span class=o>-</span><span class=n>image</span><span class=o>-</span><span class=k>tool</span><span class=o>-</span><span class=n>esp32</span> <span class=n>v0</span><span class=o>.</span><span class=mf>1.1</span> <span class=p>(</span><span class=n>Python</span> <span class=mf>3.12</span><span class=o>.</span><span class=mi>11</span><span class=p>)</span><span class=o>.</span>
</span></span><span class=line><span class=cl><span class=n>Opening</span> <span class=o>/</span><span class=n>home</span><span class=o>/</span><span class=n>j</span><span class=o>/</span><span class=n>Downloads</span><span class=o>/</span><span class=n>ESP32_GENERIC_S3</span><span class=o>-</span><span class=mi>20250415</span><span class=o>-</span><span class=n>v1</span><span class=o>.</span><span class=mf>25.0</span><span class=o>.</span><span class=n>bin</span><span class=o>...</span>
</span></span><span class=line><span class=cl><span class=n>Found</span> <span class=n>esp32s3</span> <span class=n>firmware</span> <span class=n>file</span> <span class=p>(</span><span class=mi>8</span><span class=n>MB</span> <span class=n>flash</span><span class=p>)</span><span class=o>.</span>
</span></span><span class=line><span class=cl> <span class=n>Partition</span> <span class=n>table</span> <span class=p>(</span><span class=n>flash</span> <span class=n>size</span><span class=p>:</span> <span class=mi>8</span><span class=n>MB</span><span class=p>):</span>
</span></span><span class=line><span class=cl><span class=err>╭──────────┬──────┬─────────┬──────────┬──────────┬──────────┬───────┬───────────╮</span>
</span></span><span class=line><span class=cl><span class=err>│</span> <span class=n>Name</span> <span class=err>│</span> <span class=n>Type</span> <span class=err>│</span> <span class=n>SubType</span> <span class=err>│</span> <span class=n>Offset</span> <span class=err>│</span> <span class=n>Size</span> <span class=err>│</span> <span class=n>End</span> <span class=err>│</span> <span class=n>Flags</span> <span class=err>│</span> <span class=err>│</span>
</span></span><span class=line><span class=cl><span class=err>├──────────┼──────┼─────────┼──────────┼──────────┼──────────┼───────┼───────────┤</span>
</span></span><span class=line><span class=cl><span class=err>│</span> <span class=n>nvs</span> <span class=err>│</span> <span class=n>data</span> <span class=err>│</span> <span class=n>nvs</span> <span class=err>│</span> <span class=mh>0x9000</span> <span class=err>│</span> <span class=mh>0x6000</span> <span class=err>│</span> <span class=mh>0xf000</span> <span class=err>│</span> <span class=mh>0x0</span> <span class=err>│</span> <span class=p>(</span><span class=mf>24.0</span> <span class=n>kB</span><span class=p>)</span> <span class=err>│</span>
</span></span><span class=line><span class=cl><span class=err>│</span> <span class=n>phy_init</span> <span class=err>│</span> <span class=n>data</span> <span class=err>│</span> <span class=n>phy</span> <span class=err>│</span> <span class=mh>0xf000</span> <span class=err>│</span> <span class=mh>0x1000</span> <span class=err>│</span> <span class=mh>0x10000</span> <span class=err>│</span> <span class=mh>0x0</span> <span class=err>│</span> <span class=p>(</span><span class=mf>4.0</span> <span class=n>kB</span><span class=p>)</span> <span class=err>│</span>
</span></span><span class=line><span class=cl><span class=err>│</span> <span class=n>factory</span> <span class=err>│</span> <span class=n>app</span> <span class=err>│</span> <span class=n>factory</span> <span class=err>│</span> <span class=mh>0x10000</span> <span class=err>│</span> <span class=mh>0x1f0000</span> <span class=err>│</span> <span class=mh>0x200000</span> <span class=err>│</span> <span class=mh>0x0</span> <span class=err>│</span> <span class=p>(</span><span class=mf>1.9</span> <span class=n>MB</span><span class=p>)</span> <span class=err>│</span>
</span></span><span class=line><span class=cl><span class=err>│</span> <span class=n>vfs</span> <span class=err>│</span> <span class=n>data</span> <span class=err>│</span> <span class=n>fat</span> <span class=err>│</span> <span class=mh>0x200000</span> <span class=err>│</span> <span class=mh>0x600000</span> <span class=err>│</span> <span class=mh>0x800000</span> <span class=err>│</span> <span class=mh>0x0</span> <span class=err>│</span> <span class=p>(</span><span class=mf>6.0</span> <span class=n>MB</span><span class=p>)</span> <span class=err>│</span>
</span></span><span class=line><span class=cl><span class=err>╰──────────┴──────┴─────────┴──────────┴──────────┴──────────┴───────┴───────────╯</span>
</span></span><span class=line><span class=cl><span class=n>Micropython</span> <span class=n>app</span> <span class=n>fills</span> <span class=mf>79.3</span><span class=o>%</span> <span class=n>of</span> <span class=n>factory</span> <span class=n>partition</span> <span class=p>(</span><span class=mi>410</span> <span class=n>kB</span> <span class=n>free</span><span class=p>)</span>
</span></span></code></pre></td></tr></table></div></div><div class=highlight><div class=chroma><table class=lntable><tr><td class=lntd><pre tabindex=0 class=chroma><code><span class=lnt>1
</span><span class=lnt>2
</span></code></pre></td><td class=lntd><pre tabindex=0 class=chroma><code class=language-gdscript3 data-lang=gdscript3><span class=line><span class=cl><span class=err>❯</span> <span class=n>uv</span> <span class=k>tool</span> <span class=n>run</span> <span class=n>mp</span><span class=o>-</span><span class=n>image</span><span class=o>-</span><span class=k>tool</span><span class=o>-</span><span class=n>esp32</span> <span class=o>-</span><span class=n>f</span> <span class=mi>4</span><span class=n>MB</span> <span class=o>--</span><span class=n>resize</span> <span class=n>vfs</span><span class=o>=</span><span class=mi>2</span><span class=n>MB</span> <span class=n>ESP32_GENERIC_S3</span><span class=o>-</span><span class=mi>20250415</span><span class=o>-</span><span class=n>v1</span><span class=o>.</span><span class=mf>25.0</span><span class=o>.</span><span class=n>bin</span>
</span></span><span class=line><span class=cl><span class=err>❯</span> <span class=n>uv</span> <span class=k>tool</span> <span class=n>run</span> <span class=n>esptool</span><span class=o>.</span><span class=n>py</span> <span class=o>--</span><span class=n>port</span> <span class=o>/</span><span class=n>dev</span><span class=o>/</span><span class=n>ttyACM4</span> <span class=o>--</span><span class=n>baud</span> <span class=mi>460800</span> <span class=n>write_flash</span> <span class=mi>0</span> <span class=n>ESP32_GENERIC_S3</span><span class=o>-</span><span class=mi>20250415</span><span class=o>-</span><span class=n>v1</span><span class=o>.</span><span class=mf>25.0</span><span class=o>-</span><span class=mi>4</span><span class=n>MB</span><span class=o>-</span><span class=n>resize</span><span class=o>=</span><span class=n>vfs</span><span class=o>=</span><span class=mf>2097152.</span><span class=n>bin</span>
</span></span></code></pre></td></tr></table></div></div><p>After that, I was able to install new packages with <code>mpremote</code> and <code>mip</code>:</p><div class=highlight><div class=chroma><table class=lntable><tr><td class=lntd><pre tabindex=0 class=chroma><code><span class=lnt>1
</span></code></pre></td><td class=lntd><pre tabindex=0 class=chroma><code class=language-gdscript3 data-lang=gdscript3><span class=line><span class=cl><span class=n>uv</span> <span class=k>tool</span> <span class=n>run</span> <span class=n>mpremote</span> <span class=n>mip</span> <span class=n>install</span> <span class=n>aioble</span>
</span></span></code></pre></td></tr></table></div></div><p>We can check that we are fully utilizing the 2MB of PSRAM:</p><div class=highlight><div class=chroma><table class=lntable><tr><td class=lntd><pre tabindex=0 class=chroma><code><span class=lnt>1
</span><span class=lnt>2
</span></code></pre></td><td class=lntd><pre tabindex=0 class=chroma><code class=language-gdscript3 data-lang=gdscript3><span class=line><span class=cl><span class=err>❯</span> <span class=n>uv</span> <span class=k>tool</span> <span class=n>run</span> <span class=n>mpremote</span> <span class=n>exec</span> <span class=s1>&#39;import gc;print(gc.mem_free(), &#34;bytes&#34;)&#39;</span>
</span></span><span class=line><span class=cl><span class=mi>2061456</span> <span class=n>bytes</span>
</span></span></code></pre></td></tr></table></div></div><p>If you see much less than that, you are probably using the wrong variant (try <code>SPIRAM_OCT</code>).</p></section><footer class=article-footer><section class=article-copyright><svg class="icon icon-tabler icon-tabler-copyright" width="24" height="24" viewBox="0 0 24 24" stroke-width="2" stroke="currentColor" fill="none" stroke-linecap="round" stroke-linejoin="round"><path stroke="none" d="M0 0h24v24H0z"/><circle cx="12" cy="12" r="9"/><path d="M14.5 9a3.5 4 0 100 6"/></svg>
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