I am brand new to Ardupilot and trying to flash a MatekH743-SLIM v1.5 with APM Planner v2.0.29rc1 on MacOS Ventura 13.2.1. I am trying to flash firmware version MatekH743-bdshot_Copter_4.5.4.apj from local and the output keeps freezing at:
Successfully opened MatekH743-bdshot_Copter_4.5.4.apj
Start flashing firmware.
Waiting for replug of fc connected to tty.usbmodem365A385D33301
Flight controller reconnected - reading bootloader data.
The board currently has iNav firmware running on it and that works just fine, so I can’t imagine it’s a board issue or user permissions on the host Mac.
No relation. As @lida2003 said Mission Planner and QGC. But neither will flash the bootloader if BF/iNav is on the board. Either use STM32CubeProgrammer or my typical route DFU-UTIL to flash the bootloader and then Mission Planner tpo flash Ardupilot.