If your Silicon Power V3700 USB flash drive is throwing "write-protected" errors, showing up as 0 bytes, or refusing to format through Windows, you are likely dealing with corrupted controller firmware.
When this happens, Windows sees the drive but standard formatters fail with errors like: formatter silicon power v3700 ps2251162 best
Once your USB drive is restored using the Formatter Silicon Power tool, keep these tips in mind to prevent future firmware corruptions: If your Silicon Power V3700 USB flash drive
: Secure the archive file for Formatter Silicon Power v3.7.0.0 and extract the contents to an easily accessible folder. For the PS2251-16 controller, look specifically for MPALL v3
When a drive is completely unresponsive (e.g., "Device Not Recognized" or 0MB capacity), you must use the official factory production software: . For the PS2251-16 controller, look specifically for MPALL v3.90 or newer versions that explicitly list support for 2020s-era Phison chips.
: A powerful end-user utility specifically for Phison PS2251-XX controllers. It can perform both low-level and high-level formatting. HDD Low Level Format Tool
Write down the Flash ID and VID/PID. You will need them for the MPALL configuration.