| Symptom | Cause | Fix | |--------|-------|-----| | Device not detected after flash | Wrong bootloader | Re-flash with a FULL firmware (not just UPDATE.APP) | | Wi-Fi works but no internet | Modem firmware mismatch | Flash modem-only .bin (e.g., modem_fw.bin ) | | Admin password unknown | Generic firmware reset | Try admin / password / blank. Or read hash via USB AT command | | Stuck in boot loop | Corrupt NAND | Re-flash via (rare on E5573) |