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Recently Samsung released Android 4.1.2 XXEMH4 for Galaxy S3 International version (GT-I9300). The update is available through OTA and Kies for the users of India, Sri Lanka, Bangladesh and Nepal. May be this is the final version of Android 4.1.2 for the following countries before the upcoming Android 4.3 update .The update include some battery and performance tweaks.

In this I included the steps to manually flash Android 4.1.2 Jelly bean XXEMH4 to Galaxy S3 I9300 International version using Odin.

Firmware Details
PDA: I9300XXEMH4
CSC: I9300ODDEMI2
MODEM: I9300DDEMG2

Note :
1. Backup your important data.
2. Enable USB debugging in your phone.
3. Battery must have 60% or more charge.
4. Disable or Exit Antivirus and Kies if you are installed.
5. Your PC must install Kies or Galaxy S3 driver.
6. This Firmware is only for Galaxy S3 I9300 International Version.

How To Flash Official Android 4.1.2 I9300XXEMH4 in Galaxy S3 I9300 using Odin ?

1. Download Official Android Jelly Bean 4.1.2 I9300XXEMH4 for your country from below links.
  India | Sri Lanka | Bangladesh | Nepal
2. Extract the downloaded firmware zip.
3. Download Odin v1.85 - Download
4. Now, Extract and Open odin3 v1.85.exe.
5. Power off your phone.
6. Now boot in to download mode. ( Press and hold : Volume down key and Home button ( Center button ) ,now press and hold the power button to boot in to download mode and Press Volume up on Warning)
7. In download mode connect your phone to PC.
8. Now look in to Odin... ID:COM box, it will be yellow with a port name and Added! message will be displayed.
( If not it will the problem of driver or USB ... check both )



9. In Odin..Click PDA and browse the extracted firmware folder and select I9300XXEMH4_I9300ODDEMI2_I9300DDEMG2_HOME.tar.md5 finally Click Start button.



10. After complete update Odin will show PASS on top left and phone will reboot. now unplug phone from USB.



Thats it .... Done .

Note :
If the phone stuck at the boot screen...
1. Remove and reinsert your battery.
2. Now boot into recovery mode. (Volume up + Home + Power )
3. Apply wipe data/factory reset.
4. Apply wipe cache partition.
5. Finally reboot system...

Done !

Go to the below post to root the firmware

How To Root Samsung Galaxy S3 Jelly Bean 4.1.2 XXEMH4 ?

GB-KEY HUAWEI MODULE
Ver. 1.19 Released
OBLIGATORY USE THIS VERSION

Unofficial Support Site By Welcome Zone Haldwani

If you Open an Old Version, You will Get Link to Download New one.


******************
*** Whats New ***
******************


- Hisilicon Based Phones

- Rewritten and Improved Comunication with All Hi-Silicon Based phones

no more : error getting authority

- Added Supported for engineer mobile phones World First.

HOW TO USE THIS MODULE :

This Module for servicing HUAWEI Phones is in a separated Software, not in same Classical GBKEY SW.

Download from HERE

- Open SW and go Config Tab
- Click BUY 1 Year activation
- Make payment and your GBKEy SN will be activated with HUAWEI Module for 1 year.

How to Use FRP Feature :

- Open Sw and go COnfig Tab
- Click Buy Credits and do payment
- Your GBKEY account will be filled with Credits and you will be able to do FRP Remove

Pricing :

- Module Activation price is 42 eur.
Paying this ammont, you will be able to do factory Unlock/Repair imei of all Huawei phones, unlimited during 1 year. after 1 year, a renovation is required

- FRP Remove is Credits Based, Need get Modue Activated : 1 Frp Remove = 4$


Disclaimer: This Feature is released to repair original Imei of your phone... Changing of IMEI is illegal in some countries, and we will not be held responsible for any consequences that befall

Setup Download Link for Huawei Module

Any question, Help needed, Ideas post in this Thread. All posts out of Thread Title will be deleted

Best Regards