Tap on the seven times until it says "You are now a developer." Go back to Settings > System > Developer Options .
Locate the power button and the volume buttons (usually found on the side or underside of the main display panel). unlock sunmi t2
If you bought the device second-hand, the previous owner must "unbind" the device from their Sunmi dashboard. Tap on the seven times until it says
Try swiping down from the very top of the screen repeatedly. On some older firmware versions, this allows access to the settings gear icon even when an app is pinned. Critical Safety Warning Try swiping down from the very top of the screen repeatedly
When the Sunmi logo appears, release the buttons. Use the volume keys to highlight "Wipe data/factory reset" and press the Power button to confirm.
If your T2 is stuck inside a specific point-of-sale app and you can't reach the settings:
How to Unlock the Sunmi T2: A Comprehensive Guide for Business Owners