Originally Posted by alesscam
Active sync don't work with wp7
turn off your HD7
press and hold "Volume Down" button
press "power button" and your device will go in bootloader mode
now you can flash rom
Just remember one more thing, you can't install a custom rom since we dont have any HSPL for HD7 yet.
You can however, update to an official ROM that fits your phone's region ID
Phones: Touch 3G, HD2, HD7, Galaxy S, Sensation, Galaxy Nexus, One X, Nexus 4, Lumia 720, Htc One.
Tablets: Asus TF300T, Microsoft Surface, Asus Nexus 7 (LTE)