Note: I really don't know why this works, I have contacted the dev of this rom to ask if he has any ideas but still waiting on a response.
1. Flash official TWRP
2. Flash this ColorOS rom using TWRP - http://forum.xda-developers.com/show....php?t=2772627 (you can skip all the account setups if you want)
3. Factory reset
4. Boot and setup ColorOS (you should see a network connect now with your sim card inserted, you will need to toggle mobile data on to test that)
5. If you have data in ColorOS you are good to flash back to CM11S anyway you want (you will need to factor reset after flashing back)
6. Save yourself the headache in the future and backup your EFS
Please post if this fix works for you.
Edit: I've went ahead and downloaded the ROM and I will hold on to it incase the original mirrors go down for some reason. Please PM me if they do.