The RTL9210B is not pin-compatible with the older RTL9210A. A full re-layout is required when migrating.
: If the controller becomes unresponsive, it can be forced into internal ROM mode by shorting Pins 1 (CS#) and 8 (VCC) of the SPI flash memory chip during connection. Community Resources bensuperpc/rtl9210 GitHub repository rtl9210b datasheet 2021
: USB 3.1 Gen 2, providing up to 10Gbps bandwidth. Drive Protocols : The RTL9210B is not pin-compatible with the older RTL9210A