Cannot boot MacBook from USB drive

I recently bought a used **MacBook Air 2012** and wanted to do a clean install of the OS. When restarting from **Recovery Mode** and erasing the hard drive, I saw two hard drives **"Macintosh HD"** and **"Macintosh HD - Data"**. When trying to erase the **Macintosh HD**, there was an error "*the volume on disk2s5 couldn't be unmounted because it is in use by process 659 (kextcache) couldn't unmount disk (-69888) operation failed*". I wasn't able to boot in **Safe Mode**. I couldn't start in **Recovery Mode** it defaulted to **Internet Recovery Mode**, at first I had "*pkdownload error 2*", erased the drives a few more times and got "*Can't download the additional components needed to install Mac OS X*" when trying to install from Recovery Mode. I decided to make a bootable USB drive from a backup up file "Mac OS X 10.7 Lion Install DVD.iso", using a MacBook Pro 2019 and Terminal and the prompt: diskutil unmountDisk /dev/disk3 sudo dd if="/Volumes/DriveName/10.7-Lion/Mac OS X 10.7 Lion Install DVD.iso" of=/dev/disk3 bs=1m status=progress I followed these instructions to ignore ownership on the drive, but now when I try to boot from the USB drive, I press Option, Power, type in the Wifi password, and right away I get a forbidden sign 🚫. Other things I tried: 1-The drives are not faulty because **Disk Utility First Aid** returns no errors. 2-I set the correct date in **Terminal** (after getting a feeling the internal clock was wrong) Is the MacBook Air damaged or how can I make the new install?