Switching branch with repo for Android Source code

I find working with repo as difficult as working with Android source code. Ie faced a lot of trouble while working with different versions of Android Source code. So I goggled for repo command help but didn't find much help. So I experimented a bit and found a good way of switching branch.

git reset command for removing changes that you have made

$ repo forall -c git reset --hard

then initialize repo with new branch.Suppose you have checked out version 4.0.4r1.2 and you want to revert to 4.0.1r1 ( which was my case actually ) then

$ repo init -u https://android.googlesource.com/platform/manifest -b android-4.0.1_r1

Sync repo

$ repo sync

It’s applicable for all combinations
And magic happens .