How to install Lineage OS rom in android phone | Lineage OS 14.1 (naugat 7.1.2)

Hey guys,
Here are many ways to install Lineage Os rom in android phone, but they may not work in some devices.
I classified it in two methods.

FIRST  METHOD :
Flash ROM with flashify.
This method is only useful in rooted phones, or may not work if flashify failed to find your recovery.

SECOND METHOD : (without root)
This method gives 100% guarantee to install custom roms in your phone without root and without brick your phone. Cynogenmod ROM is succeded by Lineage Os rom.
but first of all please make sure you take back up of your phone for safety.

You may also take refer from this video (in detail) and also see steps below this video.

Now Start to flash ROM's :

1. First You have to download OS rom and Open Gapps for your android phones.
2. now reboot your phone into recovery and take backup of your device.
3. now press wipe button and select advance wipe, now choose :
1. Dalvik cache
2. system
3. Data
4. Cache
4. Now install your ROM and open gapps and then reboot into your system
5. now setup your phone as you want then select Launcher
6. and enjoy your naugat features.