Regarding the inability to boot the MacOS USB stick, I've read that the newer macs can only boot from APFS drives. I tried to reset the mac to its original OS after that with Shift+ Option+ Command+ R, but after loading with a rotating earth for a few minutes I get an exclamation mark sign over that earth with the following below it: /support I booted that and got the same A software update is required to use this startup disk error in recovery. I then completely wiped the internal SSD, and using another mac and disk drill made a bootable USB with MacOS 10.15.3. I ended up getting A software update is required to use this startup disk error in recovery. I salvaged all my data in recovery mode and tried to reinstall MacOS from there. After an update to MacOS Catalina 10.15.3, my mac would stay at the bootup screen with an apple logo. My System Integrity Protection is off, and T2 security is set to None.
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