I just tried using the QPST to update to 12119 (the ROM I'm on has the modified EPST apk but it doesn't successfully change PRLs). My phone's screen turned off, then turned back on but it was showing solid black. I waited for several minutes and when nothing happened, I pulled the battery. The phone wouldn't boot up still, even after a factory data wipe from recovery.
I just reinstalled the ROM I'm on and now my PRL is on 12119. Anyone else have this bug? I don't know what caused it (probably something I did), but I just wanted to say that even though I couldn't reboot, I was still able to get the PRL I wanted. Reinstalling a ROM/running a nand backup isn't a big deal to me. Thanks for putting all of this together OP!