Backing up and restoring healthy NVRAM/NVDATA blocks from a donor A03s phone.
Disconnect the phone once the tool shows a "Success" or "Operation Completed" log. Hold the Power button to turn the device back on. Check the status by dialing *#06# on the keypad. Risks and Common Troubleshooting
[Power Off Device] ➔ [Trigger BROM Mode (Vol +/-)] ➔ [Backup NVRAM/NVDATA] ➔ [Execute Repair/Unlock] ➔ [Patch Certificate]