What is this menu?

Im not new to android, but havent realy modded any past deviced besides getting cm on an old s4 and rooting a z2.
I unlocked the bootoader and have been getting this menu on boot ever since, I just need to know whats causing it and what it is so i can check if i can stop it from popping up.

( A youtube link should be here with the video showing the menu ill try to post in the comment )

Thanks.

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