Modifying financial POS devices can easily void warranties or trigger security lockouts. Always follow these steps to secure high-quality, safe software for your machine: 1. Use the Official Sunmi Cloud
If you want, I can draft a step-by-step test plan (with commands and test durations) tailored to your transaction volume and regional configuration. sunmi p1 4g firmware high quality
The safest and highest-quality method is the Over-The-Air update. Modifying financial POS devices can easily void warranties