Originally Posted by jackson.james
hi guys, i bought a Galaxy S II GT-I9100G two weeks back and everything was running good and i updated the firmware through the official site to DZKJ2 (Android ver. 2.3.6) and now when i connect my phone to my pc via usb it shows unknown device and i dont see the usb mount option on the drop down notication menu .. and now i am in total mess .. can only transfer files via wifi .. someone help me out .. havnt rooted my phone as yet .. but first this needs to be fixed in order to root the phone i guess ... H E L P
This worked for me
1. Unplug the USB cable
2. On the cell phone, dial the following number: *#7284# Once the last # is hit, the PhoneUtil application is launched. Choose USB -> Modem and then USB -> PDA mode. The good mode should be PDA. Even if the mode is PDA, switch to Modem and then back to PDA.
3. Plug the USB cable.
* Repair USB connection for any Samsung Android phone
Reference: search youtube for "Samsung kies wont connect my samsung galaxy s!? (fix!)"