FirstChip YC2019 NAND USB2DISK 0 Bytes Fault – MPTool Recovery, VID FFFF, FlashID, Fake Capacity

User question

My Flash-Device

Artificial Intelligence Response

Direct answer to the question

• Your “NAND USB2DISK” stick is in controller-recovery mode (VID = FFFF / PID = 1201) because the firmware stored inside the FirstChip YC2019 controller is corrupted or missing, therefore the drive shows “No Media / 0 Bytes”.
• The only realistic way to revive it is to re-flash the controller with a FirstChip Mass-Production Tool (MPTool) that explicitly supports the YC2019 plus the exact NAND-flash ID installed in your device.
• The procedure is destructive – all data are irretrievably lost – and a wrong tool or wrong NAND profile will permanently brick the stick.

Detailed problem analysis

1. Failure mechanism
   • FirstChip controllers load a small boot block from an internal SPI‐like area of the NAND.
   • If that boot block is unreadable the controller falls back to “boot-ROM” mode and enumerates with the generic VID/PID above – Windows reports “no media”.

2. Hardware items that must match the MPTool configuration
   • Controller family and revision: YC2019 (sometimes reported as FC1178-YC2019 in ChipGenius).
   • NAND-flash ID string (e.g. AD3A988A for Hynix H27QDG8M2M5, or 453E98B3766B for Sandisk 32 GB BGA).
   • Number of CE lines / interleaves, bus width, bad-block limit.

3. Information you still need to collect
   • A full ChipGenius / ChipEasy / USBTreeView report while the stick is plugged in.
   • Photograph of the PCB (both sides) if the IC markings are readable – sometimes YC2019 is hidden under a blob of epoxy.
   • Capacity printed on the housing – some “64 GB” drives are actually 8 GB fakes and will show their true size after a real low-level flash.

Current information and trends

• Latest public MPTool versions that list YC2019 support are 2021-03-xx (4.08.x) and 2022-06-xx (4.09.x) builds found on usbdev.ru and the Elektroda forum threads referenced below.
• There is no official FirstChip web site; all tools circulate on community archives. MD5-check every download – trojanised archives are common.
• Rising number of counterfeit high-capacity sticks use the same controller; after a correct flash they expose the real, smaller capacity, which is normal.

Supporting explanations and details

• Why VID / PID change? Internal ROM of the controller forces VID = FFFF when no valid FW is present, so Windows shows “USB2DISK” with zero capacity.
• MPTool principle: it writes a tiny loader, scans NAND, builds bad-block map, then writes firmware + low-level format in one step.
• Typical passwords for “Setting” dialog: blank, 320, 321, 1234, 123456.
• Typical work-flow:
1) Start MPTool → Setting → load *.ini that matches your FlashID.
2) Adjust VID/PID if you want the original IDs back (shown in ChipGenius report).
3) Select “Erase-Full(Factory)” or “Clear+Factory” scan mode.
4) Press Start, wait for “PASS, OK”.
5) Unplug / re-plug → Windows format → run H2testw or F3 to verify capacity & bad blocks.

Ethical and legal aspects

• Data loss is irreversible after MPTool – advise end-users to seek professional forensic recovery first if the content is valuable.
• This procedure voids any warranty and may violate terms of service if the stick is still under RMA period.
• Distributing proprietary MPTool binaries might breach licensing; point users to publicly available links, do not re-host yourself.

Practical guidelines

Implementation checklist

1. Collect diagnostic data (ChipGenius dump, Flash-ID, photos).
2. Search usbdev.ru → flash utilities → FirstChip → pick the newest package that lists YC2019 in Setting.ini.
3. Verify archive (SHA-256). Extract on a Windows 10 x64 PC, run as Administrator.
4. Use a rear-panel USB2.0 port; disable USB-selective-suspend and any antivirus real-time engine.
5. Follow the configuration steps above.
6. Post-flash, run H2testw (write+verify) → zero errors confirm success.

Typical pitfalls & remedies
• Tool does not recognise stick = wrong generation – try older/newer build.
• “FAIL (10)” early = wrong FlashID entry – choose proper NAND table.
• Enumeration disappears mid-flash = marginal USB power → use powered hub or desktop port.

Possible disclaimers or additional notes

• Some sticks die because the NAND itself is worn-out; even a perfect flash will not resurrect them for long.
• Limited public documentation – all knowledge is reverse-engineered; no official datasheet for YC2019 exists.

Suggestions for further research

• Dump the controller ROM after repair and contribute to open reverse-engineering projects (e.g., sigrok-decode-fc).
• Investigate replacing the PCB with an open hardware mass-storage bridge (e.g., CH32V203 + U-MSD firmware).
• Study counterfeit detection – compare capacity declared by marketing vs. actual NAND ID size after MPTool.

Brief summary

Your USB stick is in FirstChip boot-ROM mode; acquire its VID/PID and FlashID, download a YC2019-capable FirstChip MPTool, configure it with the correct NAND profile, and perform a factory low-level flash. Success restores normal capacity; failure bricks the device. Provide the ChipGenius report if you need step-by-step, parameter-exact help.

Disclaimer: The responses provided by artificial intelligence (language model) may be inaccurate and misleading. Elektroda is not responsible for the accuracy, reliability, or completeness of the presented information. All responses should be verified by the user.