Finding a genuine is difficult because Phison does not support consumer repair. However, by sticking to trusted communities like usbdev.ru, properly identifying your controller, and carefully configuring the MPALL tool, you can revive a "dead" USB drive for zero cost.
If the drive is not detected by MPALL at all, you may need to force "Test Mode" Phison MPALL Flash Drive Repair Guide | PDF - Scribd phison ps225107ps2307 mptool link
The most successful tool for this controller is (specifically versions like v3.70.0E or v3.72.0B or newer supporting the 07 chip). Finding a genuine is difficult because Phison does
If you only need to fix a "Write Protected" error without flashing firmware, use the Phison Format & Restore v3.24 tool first, as it is less risky than a full firmware flash. Potential Solution Drive detected as "2307 PRAM" If you only need to fix a "Write