Galaxy J7 device was released by the Samsung in 2015. And the Company promised to give the 6.0.1 update to the Galaxy J7 which had 5.1 (lollipop) when shipped. But developers haven’t stop the limitation if the update to their J7. so they ported the LineageOS For there Galaxy J7.
As the Galaxy J7 spec support the Marshmallow as it has Exynos 7580 CPU with 1.5GB of ram and a decent camera of 13MP back and 5MP front.
Recently Galaxy J7 got the unofficial Update by the xda developer which brought the Dual sim , Camera and even the Random reboot fix. And made the unofficial port nearly stable. There are some bugs on to it still left and it seems to Get them fixed soon.
For instructions on how to install LineageOS 11 on your Galaxy J7 Duos SM-J700F (/ SM-J700M / SM-J700H) device are Simple.
All you need is:
A rooted Galaxy J7
A custom recovery like TWRP
Follow these steps:
1. Power off your phone
2. Boot into recovery (volume up + home + power key)
3. Wipe data & cache – format system, data, cache
4. Install the zip you downloaded from the link below
5. Install gapps (get the gapps from http://opengapps.org/ )
Everything leaving the not workings
> Fixed Mobile Data
> Fixed lag
> incoming Calls
> Updated Source
> Improved Battery life