Stock Android 4.1.2 Jelly Bean on Samsung Galaxy S2 GT-I9100M

How to manually upgrade or install the I9100MUGMA5 Android 4.1.2 Jelly Bean on Samsung Galaxy S2 GT-I9100M Note: This stock firmware ‘I9100MUGMA5′ is only compatible for Canada’s Samsung Galaxy S II with the specification model number “GT-I9100M″. The I9100MUGMA5 is an upgrade from previous released I9100MUGLD3 4.0.3 ICS.

Step 1: Grab the relevant files for flashing I9100MUGMA5

- Odin3_v3.07 Flasher tool Download link

- Samsung Galaxy S2 USB driver, Download link

Grab the Original I9100MUGMA5 Stock ROM

Bell – BMC_I9100MUGMA5_I9100MOYCMA5 download link

Virgin– VMC_I9100MUGMA5_I9100MOYCMA5 download link

Sasktel– BWA_I9100MUGMA5_I9100MOYCMA5 download link

Step 2: Prepare things as follows:

- Use a PC or laptop that runs in Windows OS, with a good and perfectly working USB serial port.

- Use the USB cable wire for your Galaxy S2.

- Make sure that your Galaxy S2 battery is fully charge.

- Back up all important files stored from your phone’s internal memory – contacts, messages, etc.

- Enable USB debugging from your phone’s settings. Go to Settings > Applications > Development, and tick the box that says ‘Enable USB Debugging’.

- Do a “Hard Reset” if you have a lot of 3rd party applications installed from your phone, this is useful to gain a smooth flashing. (Just make sure that you already back up all your important files before resetting your device.

Step 3: Extract or unzip the downloaded stock firmware so that you’ll get the Odin flashable .tar.md5 file. Use winzip, winrar, 7zip or any extracting tool you had in your computer.

Step 4: Run and Configure Odin

Run Odin downloader on your computer’s desktop. Watch out the check-boxes options on the right top of Odin, ensure that the ‘RE-PARTITION’ is unchecked. Leave the ‘AUTO-REBOOT and ‘F.RESET TIME’ remains ticked.

Step 5: Reboot the Galaxy S2 into Download Mode.

To put your Galaxy S2 in download mode, just simply switch it off then gently press and hold the “POWER, VOLUME DOWN and HOME” buttons simultaneously. You’ll be then prompted in a warning screen to continue (press volume up) or cancel.

Step 6: Connect the Phone to the Computer or Laptop

Once the phone screen shows in downloading mode, connect your phone to the PC with the USB cable. You’ll then notice the upper box in Odin that turns in yellow color., it also indicates the COM:ID where the device is being detected and a word “added!!’ on the log box. If somehow those things never showed up, check out the USB cable connection, read again from the top of this post.

Step 7: Load the .tar.md5 file in Odin.

Now, click on the PDA button, then browse and load the tar file that you have previously extracted. For example I’m using the Bell stock firmware on this guide so I got the “I9100MUGMA5_I9100OYCMA5_I9100MUGMA5_HOME.tar.md5″

Step 8: Flash it!

Once all set and ready, hit he “START” button to begin flashing.

Do not touch anything that might interrupt the process to avoid any fatal errors or failures, it may ruin your device if any interruption occurs while already in flashing status.

It may only takes about 2 to 5 minutes, depends of your PC/laptop speeds. A word “PASS” will display in Odin once it finishes. If somehow you will not get the word “PASS” or just stuck in a long time. Disconnect the phone, remove battery, re-insert it, check the USB connection, re-install the driver, disable Kies and any anti-virus. Set the phone in Download mode again, and repeat the whole procedure.

The phone will just automatically reboots if the firmware flashing successfully completes. Just wait until it boots up on the welcome screen logo for a while then into an android update screen. If it still shows boot logo try rebooting and if it stays there, you need to wipe your phone.

Fixing possible issues after flashing like bootloops or just stuck in welcome screen logo

Boot in recovery mode – Press and hold Volume Up, Home and Power button. Use volume keys to select up and down and power or home key to select the option.

1. Select Wipe Data/Factory Reset

2. Next select the Wipe Cache Partition

3. Lastly select Reboot System Now to reboot your Galaxy S2 in Normal mode.

Confirm your fresh firmware installed

Go to Settings>About Phone>Firmware info.

That’s it! Just let us know hows’t goin’.