Thanks to XDA Developer, Chainfire (Donate him) for his CF-Root for Samsung Galaxy S II. Basically, CF-Root is a modified kernel based original firmware kernel by adding root to it. Besides, it also adds BusyBox, Superuser, ClockworkMod recovery and CWM Manager. It is one of the ways to root Samsung Galaxy S2.
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Thanks Nima for reminding me to post this ~ FasterFix. It is an Android application that helps you to set the GPS NTP time settings in your gps.conf file. Therefore, you don’t need to edit it by yourself with Root Explorer.