I just did it recently on my rooted stock ROM. There seems to be 2 ways to get that I8150DXLC1 update, so try the first before the second.

Short Way:

1. Go to http://forum.xda-developers.com/showpost.p...835&postcount=3 and download the Odin Multi Downloader, Ancora.ops and Stock Recovery links.
2. Go to http://forum.xda-developers.com/showthread.php?t=1317394 and download the unroot.zip file. Place it in your SD card root path.
3. Boot to download mode in your phone and flash the stock recovery, replacing CWM recovery.
4. Reboot to stock recovery and flash the unroot.zip file. Your phone should now be unrooted with stock recovery.
5. Reboot normal and download the new firmware update.
6. The update process will reboot the phone and flash the update. It may fail at around 22% in a blue screen and give an error "phone verify fail", and if so, try the next steps.

Long Way:

1. Make a nandroid backup using CWM recovery.
2. Go to http://samsung-updates.com/device/?id=GT-I8150 and download the firmware update, preferably the XME region, which is Malaysia.
3. Boot to download mode and flash the above update using Odin.
4. Reboot normal and check that phone is updated to I8150DXLC1.
5. Reboot to CWM recovery and do advanced restore of data only.
6. Reboot normal and check that your data and apps are restored.

Hope this helps.

This post has been edited by lokety: Apr 9 2012, 09:20 AM