Copy the downloaded firmware file directly into the of the internal storage of the Sunmi device (do not place it inside any folder, and do not unzip it). Disconnect the USB cable. Open the System Update app on the device. Tap the three dots (Menu) in the top-right corner. Select Local Update .
Click "Download" on the PC tool, then connect your device to the PC via USB while holding the Volume Up button (this varies by build). sunmi v2 pro firmware download upd
A: Not officially. Sunmi blocks downgrades to prevent security vulnerabilities. Attempting to force a downgrade via custom recovery will likely hard-brick the device. Copy the downloaded firmware file directly into the
Usually caused by insufficient storage. Clear the cache or uninstall unused apps and try again. Tap the three dots (Menu) in the top-right corner
Ensure the battery is above 50% to prevent shutdown during the update.
Disclaimer: Firmware modification may void your warranty and PCI compliance. The author is not responsible for bricked devices. Always verify files with official sources.