i had some problems flashing firmware for Mamba H743 MK4 (version B BMI270), i downloaded MambaH743V4 firmware arducopter_with_bl.hex and flashed firmware for my FC on INAV config, but then i can’t connect to Mission Planner, My setup process is as shown below:
Try flashing the bootloader only and then upload the apj using mission planner. I had issues with the hex all-in-one