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<p>This page lists possible blink codes of the red LED located on the ESP32-CAM board, their meaning and possible solutions.</p>
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<p>The effective error codes can be found <a href="https://github.com/jomjol/AI-on-the-edge-device/blob/rolling/code/components/jomjol_helper/statusled.h">here</a>.</p>
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<h1 id="general-design-approach">General design approach:</h1>
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<ul>
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<li>250ms blink code to identify source</li>
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<li>500ms defined LED off</li>
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<li>250ms blink code to identify error / status code</li>
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<li>1,5s LED off to signal repetition</li>
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<li>e.g. 3x blinks | 500ms LED off | 2x blinks --> error: SD card not found</li>
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</ul>
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<table>
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<thead>
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<tr>
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<th><strong>source</strong></th>
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<th>source blink count</th>
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<th>error / status</th>
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<th>status blink count</th>
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<th>repeat infinite</th>
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</tr>
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</thead>
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<tbody>
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<tr>
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<td>FLASHLIGHT</td>
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<td>N/A</td>
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<td>LED on when flashlight is on (lowest prio)</td>
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<td>solid, no blinking</td>
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<td></td>
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</tr>
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<tr>
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<td>WLAN_CONN</td>
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<td>1</td>
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<td>Disconnected (No Access Point)</td>
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<td>1</td>
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<td></td>
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</tr>
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<tr>
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<td>WLAN_CONN</td>
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<td>1</td>
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<td>Disconnected (Authentication failure)</td>
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<td>2</td>
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<td></td>
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</tr>
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<tr>
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<td>WLAN_CONN</td>
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<td>1</td>
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<td>Disconnected (Timeout)</td>
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<td>3</td>
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<td></td>
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</tr>
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<tr>
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<td>WLAN_CONN</td>
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<td>1</td>
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<td>Disconnected (Error code, misc error)</td>
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<td>4</td>
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<td></td>
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</tr>
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<tr>
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<td>WLAN_INIT</td>
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<td>2</td>
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<td>WLAN.ini empty or not readable</td>
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<td>1</td>
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<td>X</td>
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</tr>
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<tr>
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<td>WLAN_INIT</td>
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<td>2</td>
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<td>SSID or password empty</td>
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<td>2</td>
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<td>X</td>
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</tr>
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<tr>
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<td>WLAN_INIT</td>
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<td>2</td>
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<td>WIFI init error (details console)</td>
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<td>3</td>
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<td>X</td>
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</tr>
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<tr>
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<td>SDCARD_INIT</td>
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<td>3</td>
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<td>SD card filesystem mount failed</td>
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<td>1</td>
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<td>X</td>
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</tr>
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<tr>
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<td>SDCARD_INIT</td>
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<td>3</td>
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<td>SD card not found (0x107)</td>
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<td>2</td>
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<td>X</td>
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</tr>
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<tr>
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<td>SDCARD_INIT</td>
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<td>3</td>
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<td>SD card init failed (details console)</td>
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<td>3</td>
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<td>X</td>
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</tr>
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<tr>
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<td>SDCARD_CHECK</td>
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<td>4</td>
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<td>Basic check: file creation/write error</td>
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<td>1</td>
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<td>X</td>
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</tr>
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<tr>
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<td>SDCARD_CHECK</td>
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<td>4</td>
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<td>Basic check: file read/CRC error</td>
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<td>2</td>
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<td>X</td>
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</tr>
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<tr>
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<td>SDCARD_CHECK</td>
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<td>4</td>
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<td>Basic check: file delete error</td>
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<td>3</td>
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<td>X</td>
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</tr>
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<tr>
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<td>SDCARD_CHECK</td>
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<td>4</td>
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<td>Basic check: folder/file presence</td>
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<td>4</td>
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<td>X</td>
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</tr>
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<tr>
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<td>CAM_INIT</td>
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<td>5</td>
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<td>Camera init failed (details console)</td>
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<td>1</td>
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<td>X</td>
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</tr>
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<tr>
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<td>CAM_INIT</td>
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<td>5</td>
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<td>Camera framebuffer check failed</td>
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<td>2</td>
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<td></td>
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</tr>
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<tr>
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<td>PSRAM_INIT</td>
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<td>6</td>
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<td>PSRAM init failed: Not found/defective</td>
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<td>1</td>
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<td>X</td>
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</tr>
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<tr>
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<td>PSRAM_INIT</td>
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<td>6</td>
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<td>External PSRAM < 4MB</td>
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<td>2</td>
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<td>X</td>
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</tr>
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<tr>
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<td>PSRAM_INIT</td>
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<td>6</td>
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<td>Total heap < 4MB</td>
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<td>3</td>
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<td>X</td>
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</tr>
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<tr>
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<td>TIME_CHECK</td>
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<td>7</td>
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<td>Missing time sync (check every round)</td>
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<td>1</td>
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<td></td>
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</tr>
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<tr>
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<td>OTA_OR_AP</td>
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<td>8</td>
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<td>OTA process ongoing</td>
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<td>1</td>
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<td>X</td>
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</tr>
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<tr>
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<td>OTA_OR_AP</td>
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<td>8</td>
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<td>Soft AP started</td>
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<td>2</td>
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<td>X</td>
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</tr>
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</tbody>
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</table>
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<p>From here -->TODO!!!</p>
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<h1 id="error">Error</h1>
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<p>Those errors make the normal operation of the device impossible.
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Most likely they are caused by a hardware issue!</p>
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<h2 id="0x00000001-psram-bad"><code>0x00000001</code> PSRAM bad</h2>
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<p>Your device most likely has no PSRAM at all or it is too small (needs to have at least 4 MBytes)!
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See <a href="../Hardware-Compatibility">Hardware Compatibility</a>.</p>
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<p>Usually the log shows something like this:</p>
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<pre><code>psram: PSRAM ID read error: 0xffffffff
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cpu_start: Failed to init external RAM!
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</code></pre>
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<h1 id="status">Status</h1>
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<p>Those Errors can be caused by an error during initialization. It is possible that the error has no impact at all or that a reboot solves it.</p>
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<h2 id="0x00000100-cam-framebuffer-bad"><code>0x00000100</code> Cam Framebuffer bad</h2>
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<p>The firmware was unable to initialize the Camera Framebuffer.
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The firmware will continue to work, but other consequential error might arise.
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A reboot of the device might help.</p>
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</html>
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