1. Downloaded cm-9-20121125-NIGHTLY-galaxys2.zip (verified MD5 checksum 1b1de8da44f6f2cc440c0168c9a1544b)
2. Reboot into Recovery and created backup.
3. Select "choose zip from internal sdcard"
4. Flashed cm-9-20121125-NIGHTLY-galaxys2.zip
5. wipe cache partition.
6. advanced > Wipe Dalvik Cache.
7. Reboot.
