[Question] Need ROM ASAP

[maticex]

Hello 2 weeks ago I bought chinese GS3. I bought it on Slovenian selling site they sold it as a Samsung galaxy s3 but I knew from the begining it is copy. Problem there is that i want to update android to JB (or if someone have another custom rom) but i don't know where to find right firmware??
It would be great even if someone has stock ROM.
Or can anyone tell me which device is it?

Phone info:
Hardware : MT6575 (MT6517 is Fake!)
Model : GT-I9300
Build number : v2.3
Build date UTC : 20130427-101814
Android v : 4.0.4
Baseband v: MAUI.11AMD.W11.50.SP.V25, 2012/12/31 10:11
Kernel v : 3.0.13 (goso61@goso61-desktop) (gcc version 4.4.3 (GCC) ) #2 Sat Apr 27 18:15:46 ULAT 2013
Uboot build v : MAIN2.2.ubt.2582
LCD Driver IC : 1-otm8009a


Thank you,
Matic

PS:Sorry for my bad English

[GizBeat]

You can try [Only registered and activated users can see links Click here to register] and [Only registered and activated users can see links Click here to register]

[maticex]

But which of ROMs should I select, can you tell me this, because GTi9300 is Samsung galaxy s3? I don't want to brick my phone...

[maticex]

Some program I don't remember which told me that this device is gal200 or something like that. But I didn't find this device on google

[GizBeat]

There are some ROMs on there that say GT i9300 MTK6575.... Probably for your phone, but I'm not sure.

Probably smart to backup your firmware first.

[maticex]

How can I backup firmware? Because I can't download CWM with ROM manager or other app?