Install CM13 Android 6.0 Marshmallow in Galaxy S4 Samsung Galaxy users who are interested in updating their device with the unofficial version of the Android 6.0 Marshmallow can quickly update the Galaxy S4 with Android 6.0 Marshmallow firmware. Users must know that this is not an official version of the upgrade. But this will inevitably bring the latest features and security updates to your device. This is an unofficial build of CyanogenMod, Android 6.0 M Firmware. We will tell you how to install this firmware on your device. Please make sure that you have rad all the steps and prerequisites before starting the procedure because doing it wrong even may make your device bricked and we won’t be responsible for any issues. First know that this is ROM that is developed by the Xda-developers and please not that the update is still in development phase, and there will be still bugs in it. But when we are at the user reviews, this ROM is safe for daily use. Please note that this is not an official version, so updating this ROM on your device will lose your device’s warranty. Please make sure that you perform a Nandroid Backup before you update your device with the latest ROM, because if you want to revert your device with the old ROM then you can do it without much hassle. Install a custom recovery image on your device to make a Nandroid backup and to perform the current operation. Insatlling a TWRP or CWM recovery is preferred. Also, make sure that your device is rooted before doing this operation. Ensure that you have performed system wipe after performing the update, this is compulsory to boot the new OS in your device. Please disable any securit features including the antivirus in your PC and make sure that you also have disabled Samsung Kies software before performing the update. Enable developers option on your Galaxy s4, go to settings and tap on the build number for seven times to show the developers options. Enable USB debugging on your Samsung Galaxy s4 by going to settings > developers options > USB debugging Make sure your device is having more than 50% of charge when doing the operation. How to Update Galaxy S4 with Unofficial CM13 Android 6.0 Marshmallow Firmware Download the CM13 firmware file to your system. Download a compatible Google Apps package. Save these files to the desktop of your computer. Connect your smartphone using the USB cable and transfer these downloaded files into your phone. Disconnect the device from the computer and Enter into recovery mode in your device Wipe your system using the options “wipe data factory reset”, “wipe cache partition” and “wipe Dalvik cache”. After clearing the system select the “install zip from sd card option” and after that select “choose zip from sd card.” Select the files that you have copied to your device and install it. Install Google Apps package the same way. After installing both the files select “reboot system now” it will take more than 10 minutes to boot the files the first time.