Phison Ps2251-07-ps2307- Mptool [best] Official

If you have a USB flash drive that shows "No Media," is write-protected, or fails to be recognized, it likely uses the Phison PS2251-07 (also known as PS2307)

This usually means the firmware file version is incompatible with your specific NAND flash. Try a different firmware (.bin) file. phison ps2251-07-ps2307- mptool

Practical impacts for users and technicians If you have a USB flash drive that