[Q] How do I choose stock firmware for my region? - Galaxy S II Q&A, Help & Troubleshooting

Hello everyone,
My phone details are as follows:
I9100XWLPT
Base Firmware: I9100XWLPT (4.0.4)
Region: Europe
Country United Kingdom / Ireland
Carrier: Unbranded
Build Date: 27 July 2012
Modem: XXLQ6
CSC: XEULPA
And this is supported by networks in my region (Pakistan). But unfortunately this has the emmc brick bug as well. If I flash the following firmware using Odin then what kinda issues I will have to face? Will my network support it? And do I need to make a backup of efs folder before flashing? How can I choose the right firmware? PLEASE GUIDE I HAVE NO IDEA.
I9100XXLPQ
Base Firmware: I9100XXLPQ (4.0.3)
Region Poland (XEO)
Build Date: 9th March 2012
Modem: XXLPQ
CSC: OXALPQ
Thanks in advance!

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shahrozeumar said:
Hello everyone,
My phone details are as follows:
I9100XWLPT
Base Firmware: I9100XWLPT (4.0.4)
Region: Europe
Country United Kingdom / Ireland
Carrier: Unbranded
Build Date: 27 July 2012
Modem: XXLQ6
CSC: XEULPA
And this is supported by networks in my region (Pakistan). But unfortunately this has the emmc brick bug as well. If I flash the following firmware using Odin then what kinda issues I will have to face? Will my network support it? And do I need to make a backup of efs folder before flashing? How can I choose the right firmware? PLEASE GUIDE I HAVE NO IDEA.
I9100XXLPQ
Base Firmware: I9100XXLPQ (4.0.3)
Region Poland (XEO)
Build Date: 9th March 2012
Modem: XXLPQ
CSC: OXALPQ
Thanks in advance!
Click to expand...
Click to collapse
You need to do some searching by yourself, that is what the search function is for. EPS Pro for backing up EFS folder: http://forum.xda-developers.com/showthread.php?t=1308546 Make a backup before flashing Siyah Kernel, and make sure you have root in order for backup to work.
You can just flash Siyah Kernel v4.1.5 via Odin to prevent brickbug in ICS v4.0.4. Look at my rooting guide in my sig, just change the CF-Root file with Siyah Kernel. Refer here: www.gokhanmoral.com/public/files/siyahkernel/v4/Siyah-s2-v4.1.5.tar
In case you are unsure what brickbug is, the stock 4.0.4 kernel has MMC_CAP_ERASE enabled which bricks your phone when a wipe data command is used in stock recovery. Siyah kernel deals with this by disabling MMC_CAP_ERASE. This command needs to be enabled for the brick to occur, so don't worry about having to change your ROM.

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But if I plan to unroot my phone latter on then I will have to get it back on stock and If I flash the same stock 4.0.4 then I wont be able to wipe data thats why I was asking about LPQ. Will it work for me?

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shahrozeumar said:
But if I plan to unroot my phone latter on then I will have to get it back on stock and If I flash the same stock 4.0.4 then I wont be able to wipe data thats why I was asking about LPQ. Will it work for me?
Click to expand...
Click to collapse
Well if you wished to unroot it and return it to stock 4.0.4 again, you would just be where you are now. Yes, you can flash 4.0.3 if you want, although I struggle to understand why you would return it to stock at a later date anyway.
If your network struggles to pick up a good signal on it, there are many modems out there that you can flash to make your network signal stronger. Refer here: http://forum.xda-developers.com/showthread.php?t=1131950