Originally Posted by GoodDayToDie
Dev-unlock and interop-unlock are just registry changes. A hard-reset will completely wipe the registry and replace it with a basic image as though on a fresh install.
Basically, almost anything that you can do to the phone while the OS is booted (so WindowBreak counts, but installing a CAB file or a custom bootloader does not) will be un-done by a hard reset.
Thx for the quick reply. The reason why I tried windowbreak was because I got this focus flash that I wanted to use on T-mobile, and I even got the sim unlock code from a dealer, but I always get a sim error when trying to input it, and the dealer suggested I try reflashing the firmware since it shouldn't say sim error, but something along the lines of wrong pin, and the sim error was baffling.
I don't know anything about windows phone roms or reflashing or any of that. I was under the impression that after using windowbreak, I could just connect to zune software and the 8107 update would show up, sort of a reflashing in a way, but with a new firmware. Connecting it to a zune doesn't do anything. Have I missed some steps? And do you think reflashing would fix the sim error and allow me to use it on t-mobile? I don't want to do anything damaging or permanent. If it is stuck on At&t and I can't use it on T-mobile, I have no choice but to sell it, and I don't want to mess it up beforehand.