If you are dealing with a "write-protected" or unrecognized USB drive based on the controller, a standard Windows format often isn't enough. You likely need a specialized "Mass Production Tool" (MPTool) to perform a low-level format and re-flash the controller firmware. What is the SM3257ENAA Low Level Format Tool?
The most reliable community repository for these tools is USBDev.ru , which hosts various versions of the SMI MPTool and specialized Dyna Mass Storage Production Tools for lower-grade flash memory.
Re-initializing a corrupted controller that prevents the drive from being detected. Downloading SMI MPTool V2.03.47 (2021 Update)
If the process fails with a "Bad Block" error, you may need to try the Dyna MPTool instead. Safety and Compatibility SMI MPTool SM32X \ SM34X [SMI Mass Production Tool]
Bypassing software-level "read-only" errors.
Recovering space on drives that show "0 bytes" or incorrect sizes.
While the core version V2.03.47 is older, updated "repacks" and firmware libraries were circulated in 2021 to support newer flash memory chips paired with the SM3257ENAA controller.