Usually when Apple wants to change something or fix a mistake to launch a new version of firmware, but what happens when this error affects only one device? It makes no sense to release a firmware for all devices and does not change anything on most devices .
This has happened with IOS 5.0.1, Apple has released a new version (build 9A406), Apple has sought to resolve this error "No SIM" or "Invalid SIM" that iPhone users had some 4S.
If you do not have this problem do not have to worry about, but if you have your only solution is to restore again. If you already have installed iOS 5.0.1 will not get any updates, that is the problem not to pull together a version also nueva.Si Apple has released firmware unencrypted ... a botched this update, hopefully appear soon IOS 5.1.
via | iClarified