How to Downgrade Samsung Galaxy S3 LTE GT-I9305 to Android 4.1.2 Jelly Bean [Back To Stock]

Firmware Version I9305XXBMF1
Android Version Android Jelly Bean 4.1.2
Is this Official? Yes!
Release Date July 2013
Credits SamMobile


Warranty may be void of your device if you follow the procedures given on this page.

You only are responsible for your device. We won’t be liable if any damage occurs to your device and/or its components.


Before you begin with guide instructions below, make sure your android device is adequately charged — at least 50% battery of the device.


To make sure your device is eligible with this, you must first confirm its model no. in ‘About device’ option under Settings. Another way to confirm model no. is by looking for it on the packaging box of your device. It must be GT-I9305!

Do not use the procedures discussed here on any other Galaxy S3 (including the Galaxy S3 variant at T-Mobile, Sprint, US-Cellular, AT&T, Verizon and other International variants) or any other device of Samsung or any other company. You have been warned!


Back up important data and stuff before you start playing around here as there are chances you might lose your apps and app-data (app settings, game progress, etc.), and in rare case, files on the internal memory, too.

For help on Backup and Restore, check out our exclusive page on that linked right below.



You must have proper and working driver installed on your windows computer to be able to successfully flash stock firmware on your Samsung Galaxy S3. In case you’re not sure, follow the link below for a definitive guide for installing driver for your Galaxy S3 LTE on your computer.




Download the Odin zip file and firmware file given below. Transfer both Odin and firmware file to a separate folder on your computer just to keep things tidy.


DOWNLOAD LINK | File name: Latest Odin3 (951 KB)


DOWNLOAD LINK | File name: (811.45 MB) [UPDATED]


  Example video: If you haven’t used Odin before to install a stock firmware or anything else, then we suggest you first watch a video of that to get familiar with the process. The video demonstrates flashing of CWM Recovery on Galaxy S3, but since the procedure is same for flashing stock firmware also, the video will helpClick here to watch the video

Important Note: Backup important files stored on internal SD card of your device, so that in case a situation arises requiring you to do a factory reset after flashing stock firmware, which might delete internal sd card too, your files will remain safe on PC.

  1. Extract/Unzip the Odin zip file, Latest Odin3 on your computer (using 7-zip free software, preferably) to get this file: Odin3 v3.09.exe
  2. Extract/Unzip the Firmware zip file, on your computer (using 7-zip free software, preferably) to get this file: I9305XXBMF1_I9305EVRBMF1_I9305XXBMF1_HOME.tar.md5
  3. Move the friwmare file, tar.md5, in the same folder in which you extracted Latest Odin3 (Just for your convenience, that is). So, now you’ll have the following files in that folder:
    • Odin3 v3.09.exe
    • I9305XXBMF1_I9305EVRBMF1_I9305XXBMF1_HOME.tar.md5
  4. Disconnect the Galaxy S3 LTE from PC if it is connected.
  5. Double-click the Odin3 v3.09.exe file to open Odin.
  6. Boot your Samsung Galaxy S3 LTE into Download Mode:
    • Power off your phone first and wait for 6-7 seconds after display is off
    • Press and hold these 3 buttons together until you see Warning! screen: Volume Down + Power + Home
    • Press Volume Up now to continue to Download Mode
  7. Connect your Galaxy S3 to PC. Odin window will show an Added!! message in bottom left box. Odin’s screen would look like this:
    If you don’t get the Added! message, here are some troubleshooting tips:
    • Make sure you have installed driver for Galaxy S3 LTE as said above in ‘Before you begin..’ section.
    • If you have already installed driver, then uninstall them and re-install back.
    • Connect using a different USB port on your PC.
    • Try a different USB cable. The original cable that came with your phone should work best, if not, try any other cable that’s new and of good quality.
    • Reboot phone and PC and then try again.
  8. Load the firmware file (extracted in Step 1) into Odin as instructed below:
    • Click on the AP button on Odin and select the I9305XXBMF1_I9305EVRBMF1_I9305XXBMF1_HOME.tar.md5 file (from step 1). Your Odin window should look like the screenshot below:
  9. Now in the Option section of Odin, make sure that Re-Partition box is unchecked. (Auto Reboot and F. Reset Time boxes remain checked, while all other boxes remain unchecked.)
  10. Double check the above two steps.
  11. Click the Start button to begin flashing stock firmware on your Samsung Galaxy S3 GT-I9305, and wait until you see a PASS! message in Odin’s top left box.
  12. When you get PASS! message, your phone will restart automatically. You can then disconnect your phone from PC.

If you see FAIL message instead of the PASS in Odin’s top left box, that’s a problem. Try this now: disconnect your Galaxy S3 from PC, close Odin, remove phone’s battery and put it back inside in 3-4 seconds, open Odin and then repeat from Step 3 of this guide again.

Also, If device is Stuck at setup connection or on any other process, then too, try this: disconnect your S3 from PC, close Odin, remove phone’s battery and put it back inside in 3-4 seconds, open Odin and then repeat from Step 3 of this guide again.


It was easy to downgrade your Samsung Galaxy S3 LTE to stock Jelly Bean 4.1.2, right? Let us know in comments below.

Your suggestions and queries, if any, are most welcomed!

  • T

    hello, I note that it says don’t try it on T-Mobile – just wanted to check if that applies to T mobile in the UK (EE) or not. thanks!!

    • Pls check your device’s model no. Install this only if it’s GT-i9305.

      • T

        Hello thanks for replying, yes the device model number is GT-i9305 but as I say its on the EE uk T mobile network. will this be a problem? as you have stated above that do not try it if you are on t mobile!? very confused and don’t want to end up bricking the phone

        • Yes, you can go ahead. We mentioned T-Mobile only to make sure that people don’t flash the firmware on the T-Mobile variant of Galaxy S3, which is SGH-T999.

          It’s completely safe to flash it on your GT-I9305 model.

  • Richard Smith

    Nope doesnt work for me keep on getting a “fail” in odin & “Unsupported version” on my phone & yes it is a UK T mobile GT-!9305 SIII LTE. Have to find this sam efile on numerous sites but 99.99% of them point to the now defuct hotfile :-(.

    Tryingthis downgrade as after the cr@py samsung update to 4.3 rendered my phone useless disconnecting from the network every 15 seconds & killing the battery in 4 hours. NOT HAPPY with samsung.

  • Buddika T

    Always ” FAIL “

  • András

    Szia nem írtad,hogy samsung s3 LTE 4.3-ról 4.1.2 vísszaállitás vagy én nem értem.
    Megmarad az imei számok, nem törlődik semmijen kód a telefonból

  • aaron


    I’m trying to downgrade my S3 I9305 for unlock reasons but i’m having trouble with the download link to the firmware you provided, please could you provide another mirror?


  • cataljn

    Hi guys! I tried to downgrade to the s3 samsung i9305 , extracting file md5 4.4.4 and wiped HBOOT and tz tar folder then I did … I tried to write with odin …. but half- way to the flash off ! 4.1.2 I wrote as fast but it stopped … I am writing 4.1.1 then on it …. and now after so many days of service gsm stuck with ” IMEI null / null , no baseband . ..: ( ( ( what to do about it? you have any ideas please ??? something