$ esptool.py -p /dev/tty.wchusbserial410 -b 115200 erase_flashÄisconnect if from USB and connect it back (reset). Then you should be able to clean flash and write firmware: ![]() You can be creative how you wire GPIO 0 to GND, just it is good to make it reversible, because you probably will need to boot it also in normal mode. Or attach a small button to the underside: Some convertors of this kind has switch for it, but most does not have so usually you have to wire GPIO 0 to GND by yourself. If you want to load some alternative firmware into it you have to boot into flashing mode.
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