CM9 RC2 was released on 19th July 2012
1. Create backup using ROM Manager.
2. Download cm-9.0.0-RC2-galaxys2.zip
3. Verify MD5 checksum ee62fd69d305d8af79e65cd7c8bdd459.
4. Reboot into CWM Recovery.
5. Flash cm-9.0.0-RC2-galaxys2.zip
6. Wipe cache partition.
7. Advanced > Wipe Dalvik Cache.
8. Reboot.
