How to dual boot Windows Phone 7 and Android on HTC HD2? Simple, just get 2 SD cards. One for Windows Phone 7 and another one for Android. By default, phone will boot into WP7 when power on. To load Android, change to another SD card and power on (don’t let go power button) then load into MAGLDR bootloader. Select ‘Boot AD SD’ to load Android. However, it is not very user friendly to bring 2 SD cards all the time. So here is the step by step guide to dual boot Windows Phone 7 and Android on HTC HD2 with 1 SD card. Check out the screenshots for SD card partition details (Disk 3 is the SD card ~ 3.7GB).