I have a SGS-2 and I have a windows Vista Home OS on my Laptop and I have Kies Version when I try to Upgrade to the latest Android Version 2.3.3, it says updating and the end it says update failed. I have tried all permutations and combinations. It just does not upgrade to the latest version of Android. like the iPhone can Android Version not be upgraded over Wi-Fi or over the Internet Connection OTA without using a USB cable. The Kies Version on my machine is Ver.184.108.40.206 Can it be a Windows Vista Problem ? I would prefer if it can be done OTA. When I try upgrading the Android Version from my phone OTA it says connection to the server failed.