This original thread is still the best in my opinion and the current "Stickied FAQs" all assume you run a Stock ROM without any fixes needed or you run a cooked ROM. It's missing how to setup a Stock ROM and once you know that you can "fix" a cooked ROM that wasn't updated (with new information) when you used it or not rereleased yet.
Third File "Unlocking Files" is the "1-2-3 Method" it's called 1-2-3 because it's a Zip with 3 files you run to "Unlock" (DISABLE SECURITY).
This thread below in my opinion should be restickied and updated.
http://forum.ppcgeeks.com/showthread.php?t=24925
This thread is the thread to watch for the new GPS DLL's, it should be renamed and Stickied !!
http://forum.ppcgeeks.com/showthread.php?t=25407
I used the ZIP so far and is a pain in the butt because you have to rename old DLL's. If old DLL's are cooked in your ROM you might be able to still overwrite ok [you won't be able to rename), I'm not 100% sure. Use Total Commander to copy files.
Oh CAB might work better, but I was nervous it installed "Kickstart" which is not needed or wanted if you use "1-2-3 Unlock Method".
I'm NOT using a cooked ROM, I'm still using the procedure in the First thread and so are many folks because the Altell ROM as is very Vogue. The heck with 6.1. All I want is a Stock Sprint like ROM with GPS. Altell ROM is 90% just that. With some work, mostly described in first thread.