Using mass-production tools (UMPTool) is a "destructive" repair method. It attempts to re-flash the firmware and will permanently delete all data on the drive.
If the software still won't see the chip, you may need to enter by shorting specific pins on the controller or NAND chip before plugging it in. flash id unknown.-0011-
The internal software that manages the data is scrambled, often after a sudden power loss or improper ejection. Physical Hardware Failure: flash id unknown.-0011-
The controller might be "stuck" and needs to be manually triggered into a special service mode. Troubleshooting and Repair Steps flash id unknown.-0011-