[Android Q&A, Help & Troubleshooting] Cobalt765:
Inactive thread for a while so here's my recent experience. Note its double up on the 'Australian' Thread but not much action there.

I got hold of an old S2 recently however some apps are no longer are compatible with it such as Runkeeper and Telstra 24/7 as they need Jellybean 4.1 and the Telstra stock rom is only 4.0.4 ICS, so I was looking how to upgrade. Flashing the Swedish stock 4.1 didn't work with Odin for me, not sure why, so I flashed CM10.1 using this method. Hope it works, if not I have no idea to fix it. DO SO AT YOUR OWN RISK.

- Ensure you have the USB drivers installed in your computer. Installing the latest Kies should fix this.

- Download Odin 3 v1.85 and unzip

- Download TWRP (dont unzip)

- Download CM10.1 (don't unzip)

- Download Gapps (don't unzip)

All are available here: – http://dropcanvas.com/ukiry

If you can, make a backup first. I didn't and was lucky that it worked fine.

1) Shutdown phone then enter bootloader menu by holding Vol -, Home, Power until something comes up. Then press Vol+

2) Run Odin

3) Connect phone to PC. A yellow box with COM:10 or similar should appear in Odin and the word 'Added' in the log.

4) Click on the PDA button and choose your TWRP.rar

5) Click Start and wait until it says Pass in green, wait until you are sure its finished.

6) Turn on phone and put CM10.1 and Gapps on the ext SD of your phone

7) Turn off phone then enter recovery menu by holding Vol-, Vol+, Power until the first Samsung logo comes up.

8) You should now be in the Team Win Recovery. Do a factory reset. Choose install then firstly choose CM10.1 from your memory card then add another file and choose Gapps. Slide to flash them. DO NOT TURN OFF PHONE.

9) Once that has finished, Wipe Dalvic / Cache.

10) Reboot and Done !!

Mine is working fine and the soft keys are all ok. Good luck !

**Further update. I seemed to have a couple of random shutdowns (though it might have been why the phone was replaced by my wife in the first place) and also the battery seemed to run out fairly quickly. An apparent CM 10.1 problem.

I got hold of CM10.2 from another site and can be found here. Was put on last night with no issues over the top of the previous. I did need a new updated TWRP though which has to be flashed via Odin.

https://www.androidpt.com/topic/4609...jelly-bean-43/

Edit: After a new Rom, I always run Better Battery Stats to check wakelocks. There was a serious wakelock of NFC happening preventing my phone from deep sleep. At that stage I didn't know what NFC was and don't use it anyway but appears a relatively common problem. Using Titanium Backup, I was able to uninstall a couple of NFC system apps and the problem appears to be fixed. There were other fixes around this forum and the net but that seemed easy. Also uninstalled various other things I don't use such as all the live wallpapers, voice search and talk.

I'd still love to be able to simply put a rooted stock rom of JB 4.1 or higher on the phone however with Odin not working with the Swedish version, along with not confident with the Skyrocket i727 keys fix and kernel, I'm a bit reluctant to experiment too much more at this stage.