The internet is full of websites offering "Rooted" or "Custom" . Do not use these.

The Sunmi V2 Pro runs on , a deeply customized operating system built on top of Android. Unlike standard consumer smartphones, Sunmi firmware integrates specialized drivers for its built-in hardware, including the Seiko thermal printer, the professional 1D/2D barcode scanner, and secure cryptographic modules for payments. Why Firmware Updates Matter

Perform a hard factory reset via Recovery Mode (Hold Power + Volume Up during boot). Missing or incorrect USB drivers on the PC.