Processors are working fine. (At least that one that I checked ) Thats not genuine product. Painting on processors wiped out so easy. I was able to flash it by stlink without troubles. Not bad delivery time.
This chip is not original. OpenOCD shows CPUTAPID 0x2ba01477 which means that this IC is the clone, propably CS32F103C8T6. Chip has STM marking but it's fake. IC is working with platformio and some modifications in gdb server startup procedure but I'm not recommending it.