Sunmi V2 Pro Firmware -

Modifying official Sunmi OS with third-party ROMs or "unlocked" firmware can lead to system instability, security risks, or permanent watermarks on the screen for certain series. How to make a SUNMI V2 Pro run faster? - HardReset.info

The firmware files for the standard V2 Pro and the V2 Pro SE are not interchangeable. If you attempt to flash V2 Pro SE firmware onto a standard V2 Pro device, or vice versa, you run a high risk of "bricking" the device—rendering it completely unusable. Always check your device settings under System > About Device to confirm the exact model number before proceeding with any update. Sunmi V2 Pro Firmware

Outdated firmware leaves your terminal vulnerable to Android exploits. Since the V2 Pro handles credit card data, running unpatched firmware violates PCI DSS compliance standards. Modifying official Sunmi OS with third-party ROMs or