I have a MacBook Air 7.2 early 2015: i5 2.4GHz, 8Gb DDR3, 121Gb SSD which is completely empty and I want to reinstall macOS on it. I booted my USB key under Macos Sierra from a dmg file with TransMac, but it doesn't appear as an option in Startup Manager.
After checking the key in Ubuntu, I finds that the EFI partition is empty (0 bytes out of 230 mb), which I think is the cause.
The internet resolution offers me as a reinstallation macOS Monterey, and it seems impossible to me with the quality of connection that I have.
How can I get the Sierra installer to boot from a USB drive?