Disabling secure boot

[Dicil]

I want to disable secure boot in my HP Compaq 510 lap for some reason but I don't found any option to disable it , I searched each and every platform only but can't get done 

[Lil_Boy_Blue]

Hi

If the BIOS does not have the option, then it cant be done.

You could try wiping the hard disk and formatting as Legacy / MBR.

Any specific reason for wanting Legacy boot?

[Dicil]

I want to install Phoenix os and play pubg , which is in 2 version 7.1 and 5.1.1 , I installed 5.1.1 and it installed with one click but when I am playing on this version game is not running it keep saying unfortunately pubg mobile is stopped and when I try to install 7.1 version , while booting it's says ACPI exception is not found , evaluating prs and next it show Phoenix os found in sda 2 after that it take a restart and open normally window and if i try to open it again it keep repeating same , I tried in Lenovo flex 10 which is a UEFI boot system and it worked on that please help me in my laptop why is it happening in Compaq 510