On your PC, launch ResearchDownload as Administrator. It should detect “Sunmi V2 Pro” in the COM port.

If using a repack, uncheck the “preloader” box. Why? A corrupted preloader (the very first boot code) from a repack will permanently brick the device. Leave the official preloader intact.

Click “Download.” The process takes 3–5 minutes. Do not disconnect the cable.

Load the firmware scatter file (usually named MT6739_Android_scatter.txt ). The tool will list partitions: preloader, boot, system, etc.

Published: October 2023 | Updated: Troubleshooting & Safety

If you are reading this, you likely own or manage a fleet of Sunmi V2 Pro devices—the sleek, durable Android-based POS terminals known for their versatility in retail, hospitality, and logistics. And you have probably typed three specific words into a search engine: .

Power off the device completely. Then, hold the Volume Down button while connecting the USB cable to the PC. This boots the V2 Pro into Download Mode (a black screen with tiny white text).