Hello, I found tons of similar questions on the net, but none of them with satisfactory answers, so I'm posting precise details here. I have a brand new Galaxy S II (received 2 days ago) which started by working fine. This morning, it got a software upgrade (standalone, not through Kies) and after the reboot, the USB connectivity is gone (so is the modem one). I tried everything, including USB debug mode and stuff, reinstalling Kies, restarting the computer, but nothing. It seems to be a driver problem: when I connect the USB cable, my Mac (Snow Leopard) says it got a connection to a 7 CDCs. But then it complains on the console, saying that it failed to find a CDC driver. My phone specs are: - GT-I9100G - Android 2.3.6 - Baseband I9100GXXKL4 Can someone please help ? Many thanks in advance.