Credit card networks frequently update their security protocols. Official firmware includes the latest EMV kernels required to accept chip-and-pin and contactless payments without errors.
On your Sunmi P1 4G, go to: Settings > About Device > Build Number Compare this with the version listed on the partner portal. If you are experiencing issues, a newer high-quality version may exist. sunmi p1 4g firmware high quality
If you cannot access the partner portal, some trusted community forums (like XDA Developers, Sunmi User Group on Telegram, or 4PDA) may share official firmware links. Look for threads with: go to: Settings >