How to install os (linux, win...) via uefi WITHOUT legacy mode (there is an answer!)?

Question

linux

*** tell me how to correctly specify the tags so that people google it?
Problem. (solution below)
Sony vaio VPCZ21X9R hardware
when trying to install the OS, the hardware refuses to see and react in any way to the bootable flash drive.
After some unorthodox manipulations on the VPCZ21X9R laptop
and a strong desire to change the OS to something other than win7 ...
(you need to boot from a USB flash drive),
I ran into an insoluble problem.
button assist (boot assistant for uefi etc...) didn't work as a result of great battles.
bios cropped and legacy mode by honest methods can not be included in any way. updated, reflashed ...
I won’t write about dishonest ones, they didn’t help either))
BUT
having bought a new external hdd with usb 3.0, I managed to start the windows xp installation process (for fun) formatting
ext hdd, this possibility disappeared.
after 7 evenings somewhere, lack of privacy, heaps of software, heaps of options through cmd...
result 0.
UEFI Legacy boot hidden - tricks to unlock it?
Unable to boot from USB

Answer 1

too lazy to write a unique text, so the source is
https://www.iphones.ru/iNotes/464190
or google:
"Installing Linux on a Mac"
///
*** Mac hardware has absolutely nothing to do with it. ***
The solution is very simple , if anyone - someone thinks that it is difficult, you are wrong.
try.
After performing the following steps, no manipulations with the legacy mode are needed. GENERALLY. Forget about it.
You just need to enable booting from an external drive and the hardware will see your USB flash drive and start installing the OS.
You need Mac os, you can use virtualbox. (Easy too)
open the link and follow steps 3 and 4.
Only them.
3. Open the Terminal utility. Our task is to convert the downloaded ISO image into a generally accepted IMG / DMG in the Mac environment. To do this, we need to run a simple command.
hdiutil convert -format UDRW -o ~/path/to/target.img ~/path/to/ubuntu.iso
4. Expand the installation image to a flash drive. After executing the above command, a new LinuxInstall.img.dmg file appeared in the Downloads folder. Our task is to deploy it to a flash drive. Make sure the USB drive is connected to the Mac and in the Terminal enter the following command:
diskutil list
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after that you will be surprised that the hardware saw the flash drive)
Personally, I was just dumbfounded when reinstalling oracle linux on imac, I decided "for fun" to try inserting a bootable USB flash drive with Linux into vaio without legacy.
dumbfounded that the installation from the flash drive booted.