Every custom firmware for Samsung Galaxy S II should be in ClockworkMod Recovery (CWM) zip format. It is easy to install firmware itself (through SD card), update patches, install mod, backup and restore. Note – install a new firmware will replace your existing firmware. Do a full system backup with CWM first if you wish to go back to the previous firmware.
Prerequisites
- ClockworkMod Recovery
- Firmware
In order to install firmware in CWM zip format, you need to have ClockworkMod Recovery on Samsung Galaxy S2 first. Follow this guide to install CWM ~ How to install ClockworkMod Recovery on Samsung Galaxy S2?