To boot into recovery mode on a Dual OS (Android + Windows) tablet, you first need to enter Droidboot Mode. Once in Droidboot, you use Volume buttons to navigate and Power button to select.
How to enter Droidboot Mode on a Dual OS Tablet
- Power off the tablet
- Press the Volume down / decrease button and keep holding
- Press the Power button and keep holding
- Keep holding both buttons till the tablet enters Droidboot
- Droidboot looks something like the image below