The Galaxy J7 is the phablet variant of the trio that was released in mid last year, and there are 50 percent chances that this model will be upgraded to Android Marshmallow. If you’ve bought this non-flagship device and you don’t want to wait until Samsung will roll out this firmware (or not), then you might consider taking into consideration this alternative custom ROM, which has been released by the XDA Developer Forum members. There are a few steps that you will need to take in order to install the CyanogenMod CM13 custom ROM on your Galaxy J7, which must bee rooted.
We must warn you that the software is an experimental preview version and it might come with bugs, but if you still want to go all the way, then read these lines carefully and don’t make any mistake, because you will risk to brick your device.
Look on the internet for the CyanogenMod CM13 (unofficial) Android 6.0 Marshmallow custom series that can be installed on the following model numbers of the Galaxy J7: SM-J700F, SM-J700H and SM-J700M. If you don’t know what model you’ve bought, go to your device’s Settings > About phone > model number. Install a USB driver on your PC and Clockwork Mod (CWM) Recovery/ TWRP on your smartphone, and make sure that the battery has at least 80 percent left of juice.
– You will need to download the CyanogenMod Android 6.0 Marshmallow CM13 [unofficial] custom ROM and the Google Apps to your computer, and connect your Galaxy J7 to it using a USB cord.
– Copy the two zip files to your phone’s SD card memory;
– Turn off your phone and unplug it from your PC;
– Enter the Recovery Mode by press holding Volume (up), Home and Power buttons at the same time;
– In Recovery mode, clear your phone’s memory, by selecting “wipe data/factory reset” – the Volume keys will be used for navigation and with the Power button, you’ll select options;
– Choose “wipe cache partition” to clear cache memory;
– Go back to the ClockworkMod recovery, select “Advanced”, then “wipe dalvik cache”;
– Return to the main recovery screen and select “install zip from SD card”;
– Select “choose zip from sdcard”, find the ROM .zip file you’ve saved in your SD card and start the installation process. Do the same with the Google Apps;
– After the installation is complete, go to +++++Go Back+++++ and reboot your phone using the “reboot system now” option you’ll see in the recovery menu;
– It will take a few minutes for the booting process to complete, then when the phone will be restarted, go to Settings and select “About phone” to confirm the installation of this unofficial custom ROM.