My PRL is hosed - please help!

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http://forum.xda-developers.com – So I think I screwed myself.... :) I was having coverage issues with my phone so I opened an issue with Verzion. My PRL version was something like 150XX and the rep though I should try updating my PRL by dialing *228 and pressing option 2. Seems harmless enough, done it before on previous phones. So the update worked and my PRL verison jumped to 54XXX(!).... and now I don't get a 4G LTE connection :). Now I cannot get my PRL back to the 150XX version and *228 doesn't work at all.....gives me a text message saying the "SIM card has already been programmed etc...etc..." (HowTos)