I know that all jailbreaks up until now have been easily removable (for warranty purposes) by simply doing a restore on the iPhone...but I understand that limera1n uses a hardware exploit rather than software, so I'm just wondering if it is still easily reversed?
It is reversable, as with all jailbreaks, the only difference with a hardware exploit, is that apple cannot patch it with a simple software update to fix the "problem", so basically, your device will always be jailbreakable with the same exploit, when tools get released to support the newer firmwares. :-D Hope that helps...
