[Galaxy S III General] Cpaez:
If you are a proud owner of a Samsung Galaxy S3 (GT-I9300), but unfortunatly, your S3 was brought from china, maybe you have the versión GT-i9300_CHN_CHN.

This Version of Galaxy S3, has the bootloader blocked, then we can not flash international firmware in this model, because odin fail in modem.

In my first steps, i found a post with a firmware mixed a French files, and China Files in one Rom (thanks to XDA). But with ICS, ( 4.1.1). So because i like put he newest, i search around the net, and XDA, and i found some ways to do that.

This is the tutorial to do that.

STEP 1.

You Need to confirm, if really you have the Gt-i9300_CHN_CHN.

Put your Mobile on Download mode ( it show in chinese) and press Vol+, in the same way you do when you flash with Odin. (to enter Download Mode press: Vol-, Power; Home)

In the Screen Must appear PRODUCT NAME: GT-i9300_CHN_CHN, It´s means, you have a Chinese Version ( its International, But Chinese).

Another way its Pressing in your Phone *#1234# and its show your versión.

The latest version on china is:

GT-I9300 Galaxy S III

PDA: I9300ZCEMD2

CSC: I9300CHNEMD2

MODEM: I9300ZCELL1

Added: 2013-04-14

The Official Link from samfirmware:

http://www.hotfile.com/dl/204467117/3bfe5c1/I9300ZCEMD2_I9300CHNEMD2_CHN.zip.html

http://www.hotfile.com/dl/204467117/3bfe5c1/I9300ZCEMD2_I9300CHNEMD2_CHN.zip.html

STEP 2.

Download the Latest CHINA FIRMWARE. and the firmware you prefer, I use the Spain (PHE)

The Official Link from Samfirmware:

Model: GT-I9300

Country: Spain

Version: Android 4.1.2

Changelist: 1287119

Build date: Thu, 27 Jun 2013 15:44:00 +0000

Product Code: PHE

PDA: I9300XXEMF6

CSC: I9300PHEEMF1

MODEM: I9300XXEMF6

Here is the Official Link from samfirmware:

http://www.hotfile.com/dl/233642717/ff467e6/I9300XXEMF6_I9300PHEEMF1_PHE.zip.html

STEP 3.

Once you have both firmwares ( china and your preferred firmware), you need to change the extensión of both files, you need to unrar your files, then you have something like this:

CHINESE FIRMWARE:

KIES_HOME_I9300ZCEMD2_I9300CHNEMD2_1133994_REV00_user_low_ship.tar.md5

SPAIN FIRMWARE:

I9300XXEMF6_I9300PHEEMF1_I9300XXEMF6_HOME.tar.md5

You need to delete the extensión .md5, it must have only .tar, just rename in Windows.

Then the both files we use are:

KIES_HOME_I9300ZCEMD2_I9300CHNEMD2_1133994_REV00_user_low_ship.tar

I9300XXEMF6_I9300PHEEMF1_I9300XXEMF6_HOME.tar

STEP 4.

Once you renamed both files, you need to unpacking.

To unpack your firmwares, you can use WINRAR, or another software who can work with tar files.

Or you can Use TOTAL COMMANDER, ( i prefer Total Commander)

https://mega.co.nz/#!WcUW3AbK!Y7yAFEL2nd_rApcW-DEliBCIokFG1em--FH28t5ifWY

STEP 5.

Once you have both firmwares unpacked, ( in diferent folders), you have to use some files from CHINA, and some files from Spain

In Both Folders we have these files:

Boot.img

Cache.img

Hidden.img

Modem.bin

Recovery.img

Sboot.bin

System.img

Tz.img

STEP 6.

From the China Firmware, I used these Files:

Sboot.bin

Tz.img

Modem.bin

From the Spain firmware, I used the rest of the files:

Boot.img

Cache.img

Hidden.img

Recovery.img (recovery can be omitted if you have a custom recovery and you don't want lose it)

System.img

We need put these files together,, if you have some software to pack files in Tar, Use it! ( with winrar you can only unpack, but you cannot repack)

In this step, i still Using Total Commander.

With total commander, you must put your files in the same folder, and click on PACK FILES.

The file resultant, is a tar file, ( you can rename the file as you want)

This file is flasheable by ODin, put in PDA just like another firmware. And flash it as the same way you know.

Remember: this is important: before you flash, you must do Factory reset, and format cache partition, in order to have a clean installation. ( many people dont do that, and after time, the mobile seems to have bugs, it is because need factory reset, and cache partition, so, DO IT!)

Once ODIN finish to flash, you must have a Galaxy S3 CHN, with Nordic Countries firmware, but with modem, and bootloader chinese.

There is Another Way to pack and unpack tar files, if you use Linux, search XDA for this, or you can use CYGWIN, wich is a Linux Console for Windows. ( search in XDA too)

With CYGWIN you can unpack and pack in tar and generate md5 checksum firmwares.

You Can change your firmware in other way too.

First you need to flash the CHINA firmware as it comes, without modifications.

Next you only need to open the Nordic Countries Firmware, with total commander, and delete, modem.bin, tz.img, sboot.bin, the rest of files still in rom. You can delete recovery too, if you have a custom one. (don’t forget backup the original file)

Then, Flash this rom without modem, via ODIN, in PDA, y that is all!.

Next you need to do Factory reset and Format Cache partition.

Note: CAUTION!, Backup your EFS folder, just in case.

Note 2: i don't test newest firmware, because the newest firmware from spain or Nordic Countries, are incompatible with the Structure and partitions in these firmwares, so, if you want use the newest firmware, try the new CHN firmware, and some firmware near to the build date of the China firmware.

If you mix incompatible firmwares, you will lost your IME.. DON'T BE AFRAID, YOU DON'T LOSS IT, IT IS JUST THERE, IN A DIFFERENT PARTITION.

In that case, return your old CHN firmware, and you will recover your IMEI, ( I do it twice)

I EDIT THIS POST TO CHANGE THE LINKS, SO ALL THE LINKS ARE THE GOOD ONE USING SPAIN XXEMF6.

THIS WORKS FINE, TESTED BY ME,

Enjoy

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