QUOTE(Mikeshashimi @ Apr 15 2014, 11:42 PM)
Sorry to Necro this thread and your post.
But I'm trying to upgrade from GB to JB for my bro but the baseband is DXLK2 and I googled and every one of the result said it is impossible for this baseband.

help.

You mean you want to upgrade your brother's S Advance from GB to JB ?
OK, here is the tutorial :
http://www.ibtimes.co.uk/galaxy-s-advance-...ellybean-457641http://www.pcnexus.net/2013/04/how-to-upda...bean-xxlq4.html( Ignore the XXLQB and XXLG4, replace it with the latest official ROM )
ROM can download from this website :
http://samsung-updates.com/device/?id=GT-I9070The latest ROM is UBLPK ( ARO = Argentina region ).
Usually, the newer the the build date, the better the experience.
If you don't want foreign country ROM, you always can download Malaysia punya ROM from that given website.
NOTE : I advise you to stay on GB because JB for S Advance is not stable. S Advance users had complaint a lot about JB being sluggish, freeze, hanging. I do experience my S Advance got hanged a lot myself. But the new Argentina ROM might have fix all those problems.
WARNING : DO AT YOUR OWN RISK. PLEASE READ CAREFULLY BEFORE PROCEED. I'M NOT RESPONSIBLE FOR ANY DAMAGE ON YOUR BRO'S S ADVANCE.
Sorry, that's all I can help. My S Advance had been stolen last year.