Because there's a way to unlock the iPhone, there's also a way to reverse that process. It was recently reported that Apple claimed a future firmware update could render an unlocked iPhone unusable, but the company apparently washed its hands off users who deliberately modified their phones against the stipulations put forth by Apple.

But just before the shining light from Heaven was no more, suddenly a "re-locking" guide rolls down the iPhone community's way, and everyone's hopeful again. If we let upgrade-or-die quarrels aside, this guide gives iPhone users a choice to get in line with the latest features, without compromising their third-party applications (limited by the extents of restore, of course).

The guide, though still quite iffy on the easy-to-follow end, has had some good feedback on re-locks and just about as many bad results. While the reason behind locking failures is still being figured out, you might want to stave off from re-locking (or updating, as the argument stands) until the success statistics feel more favorable to you.

Check the Read link below for the guide ad verbatim, which has been pointed toward the proper section for re-locking. Be aware that there is a fair chance of failing in the locking procedure and proceed with caution. The guide offers solution in Apple Mac OS X and Windows, whichever environment that suits (or is available to) you now.