You have the wrong firmware binary.
Simple tool for high-level formatting if the hardware is still recognized. PS2251-70 - PHISON Electronics Corp. phison ps225170ps2270 download full
: A user-friendly utility for low-level formatting if the drive is still recognized but shows file system errors. You have the wrong firmware binary
is a single-chip USB 2.0 to Flash micro-controller. It is a legacy part commonly used in standard USB flash drives. : USB 2.0 [12] Connector Types phison ps225170ps2270 download full
You're looking for information on the Phison PS2251-07/PS2270 firmware download. Here's what I found: