Here’s a concise technical piece on the USB controller, including its update (firmware) considerations.
Extract the Phison MPALL folder and open the application to generate a fresh configuration file. phison ps225107ps2307 upd
The Phison PS2251-07 is a robust controller, but its susceptibility to reprogramming has made it a centerpiece of the "fake flash" trade and a target for DIY recovery enthusiasts. Here’s a concise technical piece on the USB