There are instructions.... I believe you need a differnt boot loader to run the bell rom.. The bell rom will relock the phone when it is instaled. Somewhere up top in one of the stickies is a "how to" i followed it and and downgraded my Bell touch to stock and returned it for a replacement... Just follow the instructions and things should be alright!!! the thread is
http://forum.ppcgeeks.com/showthread.php?t=24979