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Once you’ve rooted your Galaxy S2, you will probably want to try out several different ROMs, which will give you goodies like longer battery life and allowing your phone to be much more customized than stock.
Before we begin, make sure you’ve made a backup copy of your current ROM, you can see How to backup/restore ROMs on Galaxy S2.
Also, if you want to backup/restore apps, use Titanium Backup to do so, here’s How to backup/restore apps on Galaxy S2.
Once you’ve got backups cleared out of the way, it’s time to install a brand, spanking new ROM on your Galaxy S2.
Go download the ROM zip file and copy it over to the root folder of your Galaxy S2’s internal storage. (DO NOT unzip the zip file!!!)
Reboot into ClockworkMod Recovery by holding down Volume Up, Home Button, and the Power Button together.
Once in ClockworkMod Recovery, do a “wipe data/factory reset”.
Then do “install zip from SD card” and “choose zip from sdcard”.
Then find the ROM zip file you copied over earlier.
Once installation of new ROM is complete, reboot and enjoy your new ROM.