A recent unofficial ROM was released to give Samsung Galaxy S4 users upgrade to Android Marshmallow. This new ROM is compatible with Samsung models such as GT-i9505G, GT-i9500, and GT-i9505.

Here is how to update your Galaxy S4 to Android 6.0 Marshmallow

First download a Samsung Galaxy USB Driver compatible to your device, this helps to avoid bugs and OS issues due to an incomplete upgrade. Ensure you have at least 75% battery power to avoid your phone going off during the upgrade process which can result in a bricked device or corrupted software.

Install a custom recovery software tool for Samsung such as ClockworkMod Odin. For installation ensure that the Odin file is extracted using WinZip (or a default extraction tool by Microsoft Windows) and stored to the root folder of the device.

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After the extraction process, press down the Volume Down and Home buttons as you switch the phone back on. Once it is on, hold the Volume Up button and start the mode for download which begins upgrading the system.

Choose PDA and tick cwm-recovery.tar, through the Odin.

Check the automatic reboot and F.Reset Time boxes and leave the Re-Partition option unchecked.

Once the installation is complete, a green text and PASS message will be displayed on the Samsung Galaxy. Unplug USB cable from the phone to begin the update installation.

After the ClockworkMod recovery mode installation is complete, to the system, download and install CM13 Gapps to upgrade to Marshmallow OS.

Using a USB cable, connect the Galaxy S4 to copy both ROMs and Google Gapps onto the device’s microSD storage.

Boot the Galaxy S4 into TWRP recovery mode and backup the phone’s data by creating TWRP, this is essential especially if the upgrade is installed incorrectly.

After the back-up process, swipe right and format the device’s data. Scroll through to the stored ROMs and Google Gapps in sdcard and begin by installing the Google Gapps.

Once the Gapps fully installed, the two ROMS will automatically start installing and the device will restart, as it boots up to the new OS.

Once upgraded, you can now sign in to your Google Account and restore your data, and begin to experience all Marshmallow has to offer.

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What's my model number?

There are several ways to locate your model number:

Option 1
On your device, go to Settings, then "About device" and scroll down to "Model number"
Option 2
Often times you can view the model number inside the device, by removing the battery
Option 3
Using Samsung's model/serial number location tool

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