Posted by Jayce Ooi as How to
Hmm… This is what most of the user don’t like to do ~ hard reset your own phone. But I am going to hard reset my HTC HD2 in the near future. Why? Most of the applications like calculator, Google Maps, Garmin Mobile XT do not able to rotate to landscape mode anymore. Luckily, Opera Mobile 10 which heavily use still working. And HTC album and music player are working fine too. Not sure why my phone behave like this. Maybe I installed some ‘dangerous’ applications… Who know? Anyway, there is the guide to hard reset HTC HD2 that I took from HTC website.
Performing a factory reset via settings
Performing a factory reset using phone buttons
By the way, do remember to backup your data first before hard reset (if you still can). You can sync with Microsoft Outlook or Microsoft My Phone to backup personal data like contacts, calendar, SMS, tasks. For programs, you need to use other backup application. Usually, I prefer a clean installation after format. So backup data to Microsoft My Phone is enough for me.