Before starting the process make sure you have rooted the device and have a custom recovery installed on your device (TWRP recovery is recommended).In this guide will tell you how to install Cm13 rom in your device by step by step guide.Just follow simple steps and enjoy Android marshmallow 6.0 in you A7.Just download Unofficial Cm13 rom for A6000 from below link.Warning: Make a backup of you current ROM before installing this CM ROM.
#How to install Cyanogenmod 13 Rom in Lenovo A6000
1.Download official CM13 Rom for Lenovo A600 and the appropriate Gapps 6.0 package from the link given below Copy it in your in your device.
2.Now place the Cyanogenmod 13 ROM and gapps 6.0 zip file in sd card.
3.Now reboot into TWRP Recovery mode
4.Then flash CM13 android marshmallow rom and gapps from the recovery in it.
5.Now Clear Cache and Clear Data.
6.Reboot your device.Done! You just flash CyanogenMod 13 from in your Lenovo A6000.Enjoy Android Marshmallow 6.0.