[Q]Firmware update question

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Hi , i recently registered in Xda-developers cuz i found out some updates for my Galaxy S II.
So , my question is how do i know what firmware i have to update , there are a lot of firmwares and i don't know which to flash...
Another question , firmware update means that my android version will change to a newer one?
And finally , reading a lot of post about updating galaxy s II with Kies or Odin , i found that a lot of people had problems flashing the phone and that sincerely scares me.. I'm afraid of bricking my phone.

Anyways , there are my Galaxy S II information :

Version of android : 2.3.3
Bandbase : I9100XWKG1
Kernel : 2.6.35.7-I9100XWKG1
Clalabeltest_I9100XWKG1
Compilation : Gingerbread.XWKG1

Note: It's unbranded. Also i noticed that in the kies update at the enf of the new firmware information it says (ITV)

Can someone help me pls? :/

Check if it says i9100 under battery, not i9100G.
Learn how to use Odin to flash.
Than come back if you want help

Sent from my GT-I9100

And don't bump your thread an hour after you started it :-/ Anyone who bumps a thread within 6 hrs of making it obviously thinks this place is their personal on-call tech support line.

Guess what ? It isn't. Show some manners/patience.

Sorry about that , i would like to apologize...