I will not b responsible for blah blah...I hope you already heard that...
This is cyanogenmod 12.1 for Y520.
It has all the cm features.So,I guess I have nothing to explain.
Everything except mentioned below.
Not Working/Possible bugs---
1)Network Dropping after every minute for 2sec.
Not dropping while on call.
I guess its not a very serious issue as the rom is perfect for daily use.But if u wanna fix that network drop,follow this---
2)Get your IMEI from phone's back(under battery) and type them on Chamelephone.
3)Hit apply and Re-boot.
Rom Download Link
Download using pc(recommended)
If u wanna dload from phone,u must have mega app installed.
Rom Name : CM 12.1
Rom OS : 5.1.1
Kernel Used : 3.4.67(kk)
MTK ROMS and REDHAWKDEVS for releasing it for mt6572.