Hi - this is issue with Samsung driver on win7. Google how to reinstall i9100g driver with win 7 and follow steps. I had the same problem before upgrade and once the re-install complete, the problem went away (i reboot comp again after re-install driver just to be sure). MY I9100G is Stock ROM ICS 4 now from Samsung and no intention to go Custom ROM.

Upgrading Stock ROM from KIES is painful and needs patience as server keeps disconnecting or time out. I did mine yesterday night around 12am and there were still some disconnections and timeouts but eventually after about 7 times, it completed the download and started the upgrade ICS ROM process.

The other thing to check is to make sure you have disabled Debugging mode in Apps>Development>Debugging - if not, KIES will not recognise your I9100G when you plug into windows.

IRO the connection to win7 issue on I9100G after ICS upgrade, I did not experience issue with KIES when I did a backup after the upgrade. Maybe can try the re-install driver solution and see if it helps.

Please always do a backup first before you upgrade eventhough it is suppose to be non-wipe upgrade. You never know what can happen.

Overall, ICS upgrade is worthwhile (it took a while to complete though) to make i9100G a smoother experience than GB when multitasking. Good job by Samsung dev team although there are still a lot of room for improvement when compared to the custom ROMS.

Sorry - it wast really re-install new drivers per se.

Here are the steps from xda forum below:-

http://forum.xda-developers.com/archive/in.../t-1343461.html


Do backup first before proceeding. Can try to use wondershare's mobilgo to backup your stuff before you try using kies

Maybe TS can put it up on the FAQ section for future references.