Arreglado el problema del Root y la firma de esta forma:
Install Cyanogen Recovery nightly
https://download.cyanogenmod.org/?device=bacon
Reboot to new recovery
Flash cm-12.1.Y0G4PAS1N0-bacon-signed.zip
Ota descargada instalarla
Sino esta la Ota descargada en el Oneplus Flash cm-bacon-7be76f9310-to-49d90510ef-signed.zip o bien si esta la
Reboot and rebuild caches
If you want root (who doesn't) then you have to fastboot flash twrp, then flash supersu