| Symptom | Likely Cause | Fix | |---------|--------------|-----| | Boot loop after flash | Incomplete flash or mismatched partitions | Re‑enter fastboot, re‑flash boot and system images. | | OTA fails to download | Corrupt cache | Wipe cache partition from recovery, retry OTA. | | Device not recognized by PC | Missing drivers / USB‑debug disabled | Reinstall drivers, enable USB debugging again. | | Missing new features | Update applied partially | Perform a full flash via fastboot, not just incremental OTA. |