https://support.apple.com/en-us/HT208330 2012 MBP don't have T2 Security Chip, therefore no Secure Boot support. So don't try secure boot on it. (which sounds this should be a WONTFIX/INVALID bug, but let shim developers decide).
https:/ /support. apple.com/ en-us/HT208330 2012 MBP don't have T2 Security Chip, therefore no Secure Boot support. So don't try secure boot on it. (which sounds this should be a WONTFIX/INVALID bug, but let shim developers decide).