[wmdunn]

PRL stands for preferred roaming list, which updates which towers your phone will connect to. As for flashing a custom rom ... please do yourself a favor and go read the stickies at the top of the "Diamond Upgrade" forum. It will give you a basic understanding of how to "unlock" your device and how to go about flashing. There are several here who will help you, but you need to help yourself a little, first. Welcome aboard ...