i use KIES and before that u need re-flash to stock den u may proceed the things

Source, http://forum.xda-developers.com/showthread.php?t=1842358

well tell me whats the possible if i flash crash v5.5 and flash xxubmg9 modem afterwards ?

how to change s4 phone name so that when i connect to someone's s4 who's tethering to me, my phone name will appear and not some android-(insert random value)?

i changed it at "device name" under settings but the name didn't appear.

Do it under configure hotspot setting in setting/thether n wifi hotspot/portable wifi hotspot /configure : something along these lines

uncle benny, wanna ask you something, if i flash a rom with ububmg9 firmwares, and flash xxubmg9 modem, will i get problem later on ?

Try it then you'll know =) no prob by right.

scare i willnt get mobile signal after this

no such function.

anyone need urgent reply >.<

Then wipe and reflash again. But always rmb to backup first

the thing is, i dont know how to back up everything..

well, i guess, if theres anything wrong, ill just flash back the old rom.. :\

Boot into CWM, and then go to Advanced > Backup.

Get to xda and look for something like this.
http://forum.xda-developers.com/showthread.php?t=1922473

Note: That guide is for note 2.

and the backup will store in my sdcard aite ?

Yes, its stored in the SD card, unless you decide to move it to the internal memory which is unnecessary.

seems battery drain issue is still going on with ububmg9, i guess will stick with xxubgm5

This is the EFS backup & Restore. Really good tool. Its essential for everyone to do this.

best price for non lte S4 how much ar now and where =p
tot of getting one tonight

This seller, directd is selling each unit at RM1777(can possibly go lower). They're based in SS15 so if you live nearby, you can pay a visit.

No problem as long as both files are meant for your phone