Before you click that “Update” button, run through this checklist to avoid a bricked terminal during business hours:
Cause: Corrupted download or USB drive issue.
Fix: Re-download the firmware (compare SHA256 checksum if provided). Format your USB drive as FAT32 (not exFAT/NTFS) and try a different USB port.
If the OTA update fails or you need to flash the device manually, use the official Sunmi Desktop Assistant. sunmi v2 pro firmware download upd
Step 1: Download the Tool
Step 2: Download the Firmware
Step 3: Connect and Flash
For end-users without a partner account: Open a ticket via support@sunmi.com. Provide: Before you click that “Update” button, run through
They will send a secure link (valid for 48 hours).