Firstchip Mptools Chipyc2019 Link -

The is a powerful "last resort" for reviving dead USB drives. While the interface might look dated and technical, it provides a level of control that standard formatting tools simply cannot match. If you have a FirstChip-based drive that has given up the ghost, this tool is your best chance at a successful recovery.

Rewrites the instruction set on the controller chip to fix "Read Only" or "Raw" file system errors. Identifying Your Chipset firstchip mptools chipyc2019

This indicates the physical NAND flash chip is too damaged to hold data. You may need to lower the "ECC" settings in the tool, though this will result in lower usable capacity. The is a powerful "last resort" for reviving dead USB drives