Iphone 4s upgrade to ios 6.1.2.

Hi,
I have had an iphone 4s running on ios5.1.1. Everything was fine and worked. Then i upgraded to ios 6.1.2. recently. The next followed.
1. I can not restore backups. Not recent, nor older. The file corrupt or incompatible... the messeage says something like this.
2. The phone tends to forget knonw networks, auto join function is not working properly.
3. NNG iGO app can not be installed at all.
I uninstalled itunes completely, shoot off the computer, reinstall it - no success.
I have restored it to original factory settings several times - no success.
Th iphone is 4s 32 gb cc one year old.
Any idea?
thanks

For the backup problem, take a look at this doc -> iOS: Troubleshooting backup issues in iTunes
for the Wi-Fi problem, try Resetting Network Settings from Settings > General > Reset. And, see this for other ideas -> iOS: Troubleshooting Wi-Fi networks and connections

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