I recently updated my Docomo Samsung Galaxy S2 (sc-02c) to Android 4.2.2 Jelly Bean. Use the following information at your own risk!
From KBC developers:
[Kernel] Android 4.2.x Jellybeans for AOSP ROM by sakuramilkI flashed it using Odin3 1.85 on Windows 7.
Following the kernel flash I booted with power+home+up to go into CWM recovery. After I backed up the existing rom I did a wipe-factory-reset.
Then I applied [ROM] CyanogenMod10.1 JP Remix for SC-02C (which I'd already put in the sdcard)
And finally 20121212 gapps from http://goo.im/
Any questions plz leave a comment.