Not able to install custom recovery

Am from Ghana.I have a new LG Verizon spectrum vs920.because I u have to unlock it and use it.I realize that it has no gsm radio so therefore I can not use 3g network and hotspot until u use their sim which is not available here.so I decided to install another another stock firmware C11 but I have to install a custom recovery.I try every means I could but but it will reboot to;secure booting error
Cause;boot certification verify
Keeps on appearing.I don't know whether is due to the unlock.so please help me solve this big problem so that I can install custom om and cynogen night c11.please help

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