Hello!
I am having troubles with my bios because the secure boot is not showing up for me at all. I have looked everywhere but nothing at all.
I am using BIOS and not UEFI. I also have the acer aspire M5910 model. My BIOS is AMI (American Megatrends INC) 1985-2010.
Here are couple of pictures from my BIOS settings:
Bios menu

Product Information

Standard CMOS Features

Advanced BiOS Features

Advanced Chipset Features

integrated Peripherals

Power Management Setup

PC Health Status

Frequency/Voltage Control

Bios Security Features

When i change the supervisor password i get this
The security option have these options

If you need more information please let me know!