Note: Now the officially released firmware in Betaflight does not support Toothpick F405 2-4S AIO Brushless Flight Controller 20A V4（BMI270), so please use the following firmware and corresponding configuration CLI.
Betaflight_4.3.0_STM32F405-RC6.hex fits for BMI270 version.
Flight controller CLI is BTFL_CLI_CRSF.
Betaflight_4.2.8_STM32F405.hex fits for MPU6000 version.
Flight controller CLI is BTFL_cli_DSMX, BTFL_cli_SBUS, BTFL_cli_TBS