Use this method if you have a Windows PC and your phone is on stock firmware.
Version 6.0.4.5 is widely regarded as one of the most stable recoveries for the Galaxy S2. It bridges the gap between older recovery styles and newer file systems, making it compatible with modern KitKat, Lollipop, and Marshmallow custom ROMs. Use this method if you have a Windows
: Flashing a CyanogenMod 10.2 Nightly often automatically installs CWM v6.0.4.5, as it was bundled with the kernel. making it compatible with modern KitKat
: Typically distributed as a .zip file for installation via an existing recovery or a .tar file for flashing via Odin on a PC. Installation Procedure Use this method if you have a Windows