The Steps To Have Better Experience With OnePlus One and Latest Lollipop ROMs

Should Follow Bellow Step.

1. Download Latest Cm Nightly Here OR Alternatively step Two
2. Yo can Have Full modem Flash-able zip from Here instead of Full nightly If you do that skip step First and also the 8 to 10 step .
3. Reboot To Recovery
4. Take Backup with Recovery Backup of every thing you can skip cache
5. Reboot phone
6. Once again go back to recovery
7. wipe system and cache in advanced wipe.
8. Install CM nightly and Gapps of your choice. (CM Nightly Is for Modem and firmware Update only )
9. Reboot device with holding volume down key this will takes you back to recovery
10. Now go to restore and restore boot and system remember restore Boot and System only
11. Reboot the Phone

Note If You prefer To Take Step 2

You can Follow Bellow Steps

1. Reboot to Recovery Take Backup
2. Reboot again to Recovery
3. Flash Full Modem Firmware update
4. wipe cache and delvik
5. Reboot Phone