[orangekid]

Yes you can actually.

Go to tmobile.com and hit the support page.

Go to ROM upgrades on your HD2 and find the stock ROM, it will ask you for your IMEI and SN.

Download the file it gives you

EXTRACT the file to a folder, in it there should be a very big .NBH file.

rename that file LEOIMG.NBH

move it to the root of your SD card.

turn your phone OFF, now hold the vol-down arrow while you turn it on.

It will tell you it is going to flash the ROM, hit power to agree, it will flash stock ROM, stock SPL, stock Radio, etc...