| Problem | Likely Cause | Solution | |--------|--------------|----------| | Device not detected | Wrong driver | Use Zadig → libusb-win32 | | Hangs at 5% | Bad NAND block | Erase flash first, or skip bad blocks | | “Device not in loader mode” | Boot pin not shorted | Double-check test point or button combo | | Tool crashes on Win11 | Old USB stack | Use a USB 2.0 hub or XP VM |
| Symptom | Likely Fix | |---------|-------------| | No response from device | Check boot mode; RX/TX swapped; baud rate mismatch | | Verify fails | Bad serial connection; flash corruption; wrong firmware offset | | Device hangs after download | Missing bootloader; incorrect reset vector; power cycle needed | sunplus loader
You must use the exact .bin flash file compatible with your hardware ID (e.g., rom.bin or force_upgrade_rom.bin ). Common Troubleshooting | Problem | Likely Cause | Solution |