Flashing SkyStars KM55A - AlkaMotors/AM32-MultiRotor-ESC-firmware GitHub Wiki
Connect ST-Link GND to ESC main GND pad (negative battery terminal) and power ESC via battery pads to flash.
Connect ST-Link SWD/SWCLK to the following pads in turn and flash each ESC on the 4in1:
| Motor | SWDIO | SWCLK |
|---|---|---|
| 4 | A | B |
| 2 | C | D |
| 3 | F | E |
| 1 | H | I |
Overall flashing process is as described in https://github.com/AlkaMotors/AM32-MultiRotor-ESC-firmware/wiki/Crawler-AM32--single-ESC-Flashing-Tutorial#step-6-stm32cubeprogrammer