Installation -
For Color OS 2 & 2.1 Users (4.4.2 & 5.0) -
Use third party recovery to Backup (TWRP).
Download Color OS 1.2.8>HERE<
Boot into ColorOS recovery
Wipe data and cache
Flash ColorOS 1.2.8 (It took 5-10 min for me to complete)
Let it boot. Then again reboot to custom recovery (TWRP)
Wipe-> data, cache, dalvik cache, system.
Flash CM13. Reboot.
It takes 5-6 minutes to boot in the first run, so don't do anything stupid.