Sunmi V2 Firmware (95% OFFICIAL)

Some users report success with this method. From the device's home screen, navigate to Tools > Network Update (or similar wording) > tap Download , then restart the device.

There are scenarios where OTA updates are impossible—such as when a device is trapped in a boot loop, suffering from severe system corruption, or operating in an offline environment without internet access. In these cases, manual firmware flashing via a computer is required. Sunmi V2 Firmware

Before performing a manual reflash, ensure all your POS data is backed up. Some users report success with this method