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Secure Boot won't disable

HP Recommended
Probook 450 G5
Microsoft Windows 10 (64-bit)

Hi. I'm working on dual booting with Linux, and every time I go into BIOS to enable Legacy Mode and disable Secure Boot, Secure Boot re-enables itself. 

I will literally go into BIOS, disable it, enter the pin number it asks me to, and restart it. When I start it back with the Linux flash drive plugged in, I get a message upon booting:

"Secure Boot does not authenticate"


I make sure to exit and save changes every time. HP support has not been able to help me save my changes in BIOS, and I have tried it probably two dozen times by now, even followed multiple different video instructions

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