K2001n Nwd Firmware -

| Issue | Likely Cause | Fix | |--------|----------------|--------------------------------------------| | "No update file found" | Wrong file name or format | Rename to update.img; ensure FAT32 | | Stuck at 99% | Corrupted download | Re-download firmware; try different USB port | | Reverse camera shows black | CAN bus setting lost | Reconfigure CAN bus protocol in factory settings (password 8888) | | Touch screen reversed | Wrong screen driver | Enter factory settings and change LCD type | | Unit won't boot after update | Wrong MCU flashed | Only solution: short test points (hardware flash) or replace board |

After the update, do not drive off immediately. Go back to Factory Settings (password 8888): K2001n Nwd Firmware

This is the trickiest part. Official support websites for these Chinese units are notoriously absent. Here are the safest sources: | Issue | Likely Cause | Fix |

Cause: MCU mismatch.
Fix: Reload only the MCU file. Place mcu.bin alone on an SD card, then go to Settings → System → MCU Update (password 1234). Select the file and update. Do not touch the unit for 2 minutes. Here are the safest sources: Cause: MCU mismatch