Bootloader mode¶

Heltec V4 dropped the CP2102 path — enter download / bootloader mode before the web flasher.

Steps¶

Board stays plugged in over USB-C:

1. Hold USER (also PRG on some silk).
2. Tap RST once.
3. Release USER.

The serial port name can change after this — reselect the Espressif / ttyACM* device in the browser if asked.

Next: Flash firmware.