Solved Convert Uefi To Legacy Without Losing Data

If you simply want to ‘see’ the old legacy BIOS look, I know that some BIOS have the option so view the BIOS in the old style so you see the plain list style and go back to using the arrow keys instead of the mouse. I am not sure if all of them or yours has this feature but you can look into it.

I do not see and advantage in going from GPT to MBR for the hard drives since it limits the partition size and the number of partitions (though multiple drives is getting more popular than multiple partitions these days). Also UEFI supports PCIe boot which is a good performance advantage.

I am not sure what you are trying to achieve and why. Maybe explaining that might help with recommendations.

You have to be a little bit crazy to keep you from going insane.