Did yout try it out yourself and verified phone is not re-locked ?
I tried it on my unlocked orange uk phone, if it did relock it, then it locked it to orange uk & I can't see why it'd do that, surely if it was going to network lock the phone it'd lock it to t-mobile hungary. I kept the orange sim in while i flashed the phone & while i was running the hungarian rom, it didn't give me an error, but i didn't try a non-orange sim while running the hungarian rom. It's unlocked now, I just tried an O2 sim, it works, but I'm running modaco froyo alpha 3 now, I'm not sure if that unlocks it (if not, then this update definitely wont relock an unlocked phone).
So, I'm pretty sure it doesn't relock the phone.
I'm not sure I needed to apply the update, it was late & I'd just got my new replacement, I might have looked at the free ram instead of total ram, but it did no harm at all to my uk orange tft san francisco.
It does remove clockworkmod, but that can be reflashed with fastboot.
Edited by wbaw, 29 December 2010 - 12:28 PM.