Help Upgrading S2 Skyrocket to ICS

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http://forum.xda-developers.com – First I have a unroot and unlocked galaxy s2 skyrocket, I tried several times upgrade my galaxy s2 skyrocket to ICS through Kies Software but every time I have the same issue. After Kies says that there is a new firmware to my device and ask me if I want to upgrade, Kies starts to download and reach the 100% but after that nothing happens, the phone reconnect again to kies and say the same thing. I run the software as admin, also use the Samsung usb cable, also reinstall Kies severeal times, I changed the usb port of my pc, the USB debuggin mode is always on, I dont know what else I can (HowTos)