If you tell me the you're seeing or the current state of your USB , I can provide more specific troubleshooting steps for that PS2251 controller. write protected usb stick | Technibble Forums
For official firmware updates, visit the Silicon Power Support Center.
: With a single click on "Format," the tool initiated a low-level reset. It was a digital "clearing of the slate," stripping away the corrupted flags that had frozen the NAND flash memory in time. The Result
The official "Mass Production Tool" used for deeper firmware flashing. Phison ST-Tool: