Check the “V2” changelog. Usually, V2 adds support for a different touch panel (GT911 vs FT5x06). Flashing V2 on non-V2 hardware will make the touch screen unresponsive. Do not flash unless confirmed.
Go to Settings → Factory Settings (or use code 123456 , 8888 , 000000 , or 1617 ). Reconfigure: ums512-1h10-natv firmware update
: Use an empty USB stick (maximum 32GB) and format it to FAT32 . Check the “V2” changelog
Right-click UpgradeDownload.exe and select . Check the “V2” changelog. Usually