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Tweet
I strongly suspect that the major difference between any of these lies in the firmware.
That unpopulated block of 8 pads by the power connector is now making sense. The pair of pins labeled RST is just what it says--RESET when shorted. At the top end of the block, near the "J3" label we have a +3.3V supply and the BOOT0 pin from the MCU. Tying the 2 of these together causes the serial programmer to be activated after a RESET. The other pins are variously ground, and the USART1 Rx and Tx pins, as well as the SWCLK SWDIO pins for a JTAG debugger.
So,unless the manufacturer of this thing happened to blow the "protect" fuse, we can get the firmware out (and into) this thing.
Stay tuned...