| Symptom | Likely Cause | Solution | |-----------------------------|-------------------------------|----------------------------------------| | Device not detected | Wrong driver or cable | Reinstall USB drivers; use shielded cable | | Download fails at 50% | Corrupted firmware file | Re-download .bin and verify SHA-256 | | Verification mismatch | Flash write error | Retry after full erase ( --force ) | | Bootloop after update | Incompatible bootloader | Revert to last stable via recovery mode |