Help me Please ASAP!!!( lg g flex japan au kddi) - LG G Flex

Hi everyone , I am manav , i am having a lg g flex japan au kddi . I was trying to install twrp custom recovery but boot certification verify error occurred . it boots for 5seconds with message showing=
boot certification verify
{740}
{740}boot failed
[740]
I am new user to these things . please help me . guide me how to fix it . ASAP
Contact info=[email protected],[email protected]
Phone no.=+919893970805

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