Update PRL icon does not work on custom ROMS, you have two options reflash to the base Sprint ROM and run it from there
or, follow the steps at this thread.
http://forum.ppcgeeks.com/showthread...ighlight=60650 I have done it,
with no problems just make sure you read the directions and follow each step carefully. For reference the MSL Grabber can
be obtained here..
http://www.baf.cc/bafmsl
I stand corrected, you can update from a custom rom, I read several articles, stating the opposite... See below for further details..