launch on real hardware

[tech-voyager]

I rebuilt .img .iso

and it turned out that the OS version from the first part does not support UEFI. What should I do?

[ghost]

You should burn the img on a flash drive. I recommend Balena Etcher (but feel free to use dd if you want). After that, boot into the motherboard's bios and enable csm support.
You should now restart and run the os as mbr not uefi.

https://wiki.osdev.org/Bootable_CD
Also use this guide if it helps.

Hope it works!

[rouisaek]

Disable UEFI MODE. So you can start in BIOS MODE by default.