| Symptom | Likely Cause | OTP-Safe Solution | | :--- | :--- | :--- | | "ERR" or "E01" on display | Wrong firmware version | Reflash with correct 2023 file. Do not use force erase. | | Receiver powers on but black screen | Incompatible boot logo size | Use RS232 to load a minimal recovery file (bootloader intact). | | USB not recognized in flash mode | USB drive too large (>8GB) or not FAT32 | Retry with 4GB USB 2.0 drive. | | Stuck at "WRITE" for >10 mins | Bad NAND block | Power cycle (risky). If bootloader dead, board is e-waste. |
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