So; here's the magic combination that worked for me today; resulting in an unlocked Cyanogenmod Kitkat install. Generally, I was following the Cyanogenmod guide for the device, but relied on various forum posts and some articles on ibtimes.co.uk to get there in the end.
- ODIN v.3.0.7.
- Heimdall repeatedly failed for me, and guides suggesting ODIN v.1.8.5 are out of date.
- Installed under 'PDA' in ODIN, above.
- This build of CWM can't actually install Kitkat, resulting in "set_metadata_recursive: some changes failed" caused by a change in the image format since JellyBean. Some info here. Still, you need it to bootstrap the CWM upgrade below.
- Unfortunately, this seems to have broken mass storage support on the device, which made getting the next few zip files onto the SD card a little tricky for me. If this happens to you, install the Android dev tools, and use `adb push`.
- This contains a build of CWM 22.214.171.124, which can actually install Kitkat.
- Install this from its zip in CWM, then reboot. Check the version of CWM at the top to make sure that it succeeded.
- installed via zip from CWM
- Galaxy S2 SIM Unlock
- from the Play Store after you've rebooted into CM
As a final note, I did install the jeboo_kernel_i9100_v1-2a.tar early in the process, which may have helped me get into ClockworkMod later on. I'm not 100% on whether it's necessary or not.