So I tried setting up this dual boot option on my SGS2. So far I have not had much success and this was the second attempt. I am going to be third time lucky I am sure, as I am learning each time what NOT to do. So far I have done the following:

1. Backed up my primary OS which is Gingerbread 2.3.4, Lite’ning ROM v6.0 with all my apps, themes and games.
2. Installed all the necessary rooted tools which would make flashing a new ROM possible:
1. ClockWorkModule.
2. Lolboot-Setup.
3. ROM Manager.
4. Root Explorer.
5. Odin Mobile Pro.
3. Downloaded XXKP1 Android 4.0 Ice Cream Sandwich ROM from here. (BTW: I found this information on Jayce Ooi’s Paradise (aweosme website)).
4. Extracted the two files PDA = I9100_CODE_I9100XXKP1_CL16459_REV02_eng_mid_ship.tar.md5 and PHONE = MODEM_I9100XXKP1_REV_02_CL1085642.tar.md5)and copied them onto my External SD Card.
5. Ran Odin Mobile Pro and pointed the app to the two files on my External SD Card. It imported the values into Odin and I then hit the start button.
6. Less than 10 minutes later I had Android 4.0 Ice Cream Sandwich ROM installed successfully.
1. Spent most of my Saturday afternoon installing all the Apps and Games I had on my primary OS.
2. Ran LolBoot-Setup and went to “Set up/Install Option” and ran the option “cache current OS for use as secondary”.
3. As a precautionary measure, I took a full backup and copied it to my External SD Card.
7. Rebooted into Recovery Mode and restored my original Lite’ning ROM v6.0 (Gingerbread 2.3.4).
8. Upon successful boot up I ran LolBoot-setup again and ran “Set up/Install Option” again and selected “set up cached system as secondary” option.  This was successful.
9. Finally I had to select a Kernal and this is where I believe I went wrong.  (I picked the wrong one).
10. When I rebooted my SGS2 stuck at the boot up screen.

I had to take the battery out, and use my Download JIG to bring it into recovery mode, where I was able to then plug a PC/USB cable in and restore ICS with Odin3 v1.85.

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