Shut down the PC, unplug power, remove the laptop battery (if possible), hold the power button for 30 seconds, then restart. Device Manager: Uninstall "Unknown USB Device" and restart. Disable Power Saving:
| Error Code | Meaning | Solution | | :--- | :--- | :--- | | | Device not responding | Reinstall driver; restart PC; use USB 2.0 port | | Error 0x28 | NAND ID mismatch | Your chip is not in the CHIPYC2019 DB. Try a different MPTOOLS version (2020 or 2021). | | Error 0x43 | Bad block table full | The NAND is dead. No recovery possible. | | Stuck at 50% (Sorting) | Unstable NAND voltage | Remove power, short the NAND pins 29-30, replug. | firstchip mptools chipyc2019
FirstChip (Shenzhen FirstChip Technology) is a Chinese manufacturer of USB flash drive controller chips. If you have a USB drive that is "write-protected," shows the wrong capacity (e.g., a 32GB drive showing as 64GB), or is not recognized by Windows, this tool is often the software used to "factory reset" the drive at the firmware level. Shut down the PC, unplug power, remove the
FirstChip MpTools (ChipYC2019) is a specialized mass production tool used to repair and reflash USB flash drives that utilize controllers, specifically models like Try a different MPTOOLS version (2020 or 2021)
(Mass Production Tools) are the official low-level formatting and configuration utilities for FirstChip controllers. They are not intended for everyday users but for factories and repair technicians.
You plug in a USB drive. Windows detects it, but shows Capacity: 0 bytes . You cannot format it. This happens when the NAND controller loses its firmware mapping table. bypasses the operating system’s driver stack and communicates directly via SCSI (Small Computer System Interface) pass-through to reload the firmware.
The Firstchip Mptools Chipyc2019 has the following technical specifications: