OP wrote:
"I just tried to create a bootable usb using a Mac."
Could you explain this a bit more clearly?
What KIND of "bootable USB" are you talking about?
Is it:
- A USB flashdrive "installer" (installs copy of OS onto another drive)?
or
- A bootable drive that RUNS the OS, does not "install"?
If you're using an m-series Mac, I don't believe that you can create (on a USB flashdrive) a bootable-to-the-finder version of the OS. They just don't work, probably due to speed and disk controller issues.
You CAN create a bootable flashdrive installer.
Try downloading "Mist":
https://github.com/ninxsoft/Mist (tells you how it works)
A Mac utility that automatically downloads macOS Firmwares / Installers. - ninxsoft/Mist
github.com
(download the "dmg" file from above URL)
Mist will download the OS you need AND create a bootable flashdrive installer, all in one integrated process. Worth a try. And... it's free.