LINK DISCUSIÓN EN XDA:
http://forum.xda-developers.com/nexu...eased-t3256254
1.Make sure you have Unlocked bootloader.
2.Your device must have custom recovery (TWRP) to install CM13 rom in it.
3.Always make backup of Current rom Before flashing any rom in your device.
#How to install official Cyanogenmod 13 rom in Nexus 5X
1.Download official CM 13 nightly for Nexus 5X.and the appropriate Gapps 6.0 package from link given below Copy it in your in your device.
2.Now place the Official Cyanogenmod 13 rom and gapps 6.0 zip file in sd card.
3.Now reboot to Recovery mode.
4.Then flash CM13 rom and Gapps 6.0 from recovery in it.
5.Now Clear cache and Clear Data.
6.Reboot your device.Done! you just flash Official cyanogenmod 13 rom in your nexus 5X.
Enjoy Android Marshmallow 6.0 !.
Todas las build de CM13
Ir al link original: http://get.cm/?device=bullhead