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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:
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