The archive contains CWM Recovery installation file , Odin and the rooting file.
The process will be the following: first you will install CWM Revovery on your device using Odin.
"We've been working closely with Samsung on this, and we can confirm that we will be rolling out the ICS update for Samsung Galaxy S2 from 22 April," T-Mobile told me in a statement.
First of all, I want to make it clear that Samsung has officially stopped the updates for Galaxy S II and therefore there are no latest official Android OS firmware updates for it.
But the good news is that there are several Custom ROMs available that you use to update your Galaxy s2 to the latest Android OS available out there for many Android Smartphones.
The next logical update for the Galaxy S2 is Android 4.1, Jelly Bean and that should be coming soon as it has already started rolling out in other countries.
The Galaxy S2 Android 4.1, Jelly Bean update finally starting rolling out this week.