very much like 2.0 but hall pins need different ordering !
Has a third led header, 3pin with the middle pin being controlled by PB5, right pin is simply blinking.
Warning: both 3pin led header pull down from battery voltage! 4pin led header pulls down from the usual 14V
The usual second serial port to the left of the St-Link flash header is only PB4 on both middle pins.
USART0 can be found on the empty bluetooth module pads:
Maybe better bend the GND pin in the opposite direction and solder the female Dupont header horizontal so that the RX pin can not shortcut to GND
slave board:
my next test setup (can no longer count them):