Upgrade of iPhone 3GS to IOS 6.1.2 failed and gave me no reason/error code (normal for iTunes). The only option it gave me was a restore to factory settings. This I did but now the Activation via Wifi refuses to work.
The most risky operation on any iPhone or iPad is the IOS upgrade. In my experience 1 in 4 fail disasterously with no explanation. The upgrade of my old iPhone 3GS from IOS 6.0 something to 6.1.2 has just failed at the very end of the upgrade process, giving no error message or reason. The only option it offered me was a "Restore" by which it ment back to the factory settings; I was not offered a restore from backup. This was done and now I have to go through the Activation process, select language, region/country and wifi network before the Activation attempt which always fails with the reason"Your iPhone coulde not be activated because the activation server is temporarily unavailable.......". Also the phone does not connect to the mobile network. I am physically located in Germany with a SIM from a French Operator SFR.
I have wasted many hours on this iPhone/iTunes bug and am fast losing my patience with Apple and its software bugs.
iPhone 3GS, iOS 6.1.2