Why would you link someone who has clearly stated they have an I9100 to I9100G firmware ? You do realise a lot of people who ask for help here take whatever help you give them rather literally & tend to blindly do what they're told without thinking ?
I hope for your sake this guy doesn't download one of the firmwares you linked to & flash it, you owe him a new phone if he does.
Edit - OP, you're very confused. There was only one 4.1.2 I9100 stock firmware released for Venezuela, which is available on Samfirmware - VNO - I9100UHMS8. There is no 4.1.2 firmware XXLPQ. You can use any stock firmware from any carrier, it doesn't make any difference. However, you seem to be completely lacking in 'the basics'. If you attempt to flash anything with your current lack of knowledge, you're asking for a busted phone. Read the guides/tutorials stickied near the top of the General section before you do anything.
If it's important enough to cause you grief if it's lost, back it up. No excuses
Trolling for thanks is lame
Does Samsung's auto-brightness implementation crap drive you to self-harm ? A solution !
Failure to search is the leading cause of male impotence on XDA
If you don't know how to recover if things go wrong, what are you doing flashing custom roms ?