Legacy - June 20, 2013 at 4:42am
IMEI DOES require that you restore through iTunes for the unlock to take affect, so you WILL lose your jailbreak in the process. However, I believe that IMEI only supports up to iOS 6.1.2 (please correct me if wrong), meaning that you will not be updated after restoring- all you'd have to do is simply run Evas1on and re-jailbreak it. If you have a lot of sources and tweaks downloaded on cydia, be sure to either back them up via Cydia or make note of what you have for later. Hope this helps ya, bud!