Firmware — Sunmi P1 4g

Golden rule: Only use firmware obtained directly from Sunmi or your authorized service partner.

| Problem | Likely Cause | Solution | | :--- | :--- | :--- | | 4G stopped working | Wrong baseband or APN mismatch | Re-flash correct regional firmware + reset APN to default | | Scanner doesn't trigger | Kernel driver mismatch | Downgrade to last known stable version | | Battery drains fast | Corrupted power management firmware | Perform factory reset from recovery after flashing | | Stuck in boot loop | Incomplete OTA or wrong ROM | Enter recovery → Wipe data/cache → Re-flash update.zip | | No touch response | Display driver version mismatch | Force power cycle (hold Power 15 sec) → reflash correct variant | Sunmi P1 4g Firmware

Occasionally, updates reset printer settings. Ensure your POS application has the correct paper width settings (usually 58mm for P1) and check if you need to reinstall the Sunmi Printer Service APK. Golden rule: Only use firmware obtained directly from

Golden rule: Only use firmware obtained directly from Sunmi or your authorized service partner.

| Problem | Likely Cause | Solution | | :--- | :--- | :--- | | 4G stopped working | Wrong baseband or APN mismatch | Re-flash correct regional firmware + reset APN to default | | Scanner doesn't trigger | Kernel driver mismatch | Downgrade to last known stable version | | Battery drains fast | Corrupted power management firmware | Perform factory reset from recovery after flashing | | Stuck in boot loop | Incomplete OTA or wrong ROM | Enter recovery → Wipe data/cache → Re-flash update.zip | | No touch response | Display driver version mismatch | Force power cycle (hold Power 15 sec) → reflash correct variant |

Occasionally, updates reset printer settings. Ensure your POS application has the correct paper width settings (usually 58mm for P1) and check if you need to reinstall the Sunmi Printer Service APK.