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It is not necessary to reinstall a UF2 bootloader you unless a <b>BOOT</b> drive is not visible
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when in UF2 bootloader mode, or you know of a problem with your current UF2 bootloader.
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</p>
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<p>
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If a UF2 bootloader has never been installed on the board, or the UF2 bootloader was removed by erasing or overwriting the flash, the UF2 bootloader must be installed in order to flash <b>.uf2</b> files onto the board. <b>.bin</b> files can be uploaded without a UF2 bootloader, using the
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<ahref="https://adafruit.github.io/Adafruit_WebSerial_ESPTool/">ESP Web Flasher</a>
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or <b>esptool.py</b>.
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</p>
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<p>
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<em>Note: <b>update.uf2</b> files are not currently working on ESP32-S2 or ESP32-S3 boards.</em>
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</p>
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<p><strong><em>Important</em></strong>:
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<em>this will erase previously flashed firmware and sketches from the board,
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but needs to be perfomed only once.</em>
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</p>
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<p><em>The instructions here are general.
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We recommend you consult the manufacturer's board documentation for detailed
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instructions, which may be different.</em>
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</p>
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<ul>
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<li>Unzip to find the file <b>combined.bin</b>.</li>
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<li>Place board in bootloader mode:
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<ul>
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<li>Plug board into a USB port on your computer using a data/sync cable. Make sure it is the only board plugged in, and that a charge-only cable is not being used.</li>
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<li>Press and <strong>hold down</strong> the <b>BOOT</b> or <b>0</b> button.</li>
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<li>Press and <strong>release</strong> the <b>RESET</b> or <b>RST</b> button.</li>
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<li>Release the <b>BOOT</b> button.</li>
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</ul>
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</li>
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<li>Upload <b>combined.bin</b> (Google Chrome 89 or newer):
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<ul>
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<li>Open <ahref="https://adafruit.github.io/Adafruit_WebSerial_ESPTool/">ESP Web Flasher</a> in a new window/tab.</li>
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<li>Select <b>460800 Baud</b> from the pull-down menu (top-right).</li>
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<li>Click <b>Connect</b> (top-right).</li>
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<li>Select the COM or Serial port from the pop-up window.</li>
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