•First download the apk file ( https://mega.co.nz/#!kN8FxQLA!wbRMCu3JYESpHK8uFAIIMSAH2Pm0OCUtM3DAhqV_wdI ) and transfer it to SD card on your Mobile.
•Now open the Default File manager which comes with Cyanogenmod OS or you can use any file manager which we can access its system storage.
•If you don’t find the system storage on Cyanogenmod File manager then go to settings>General settings>Advanced mode> Select Root Access mode.
•Enter into System storage then go to Priv apps and there find an apk called keyguard.apk and delete that. It says operation failed but it works and it is deleted.
•Now Select and paste the downloaded CMkeyguard.apk in sytem storage>priv apps > and paste it.
When you complete the process just reboot the device & finally you can see the Oneplus One Lockscreen on your device.
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