Adafruit_Learning_System_Guides
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compile ESP32 passthrough utility with TinyUSB
NINA-FW 1.7.5 failed to upload completely on MatrixPortal M4, PyPortal M4, etc. See https://github.com/adafruit/nina-fw/issues/53. After experimentation, I narrowed down the problem to something involving the Adafruit SAMD Arduino USB stack. Using TinyUSB instead fixes the problem. New versions of the passthrough were uploaded to https://learn.adafruit.com/upgrading-esp32-firmware/upgrade-all-in-one-esp32-airlift-firmware#upload-passthrough-code-3124109.