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So I installed windows on a Mac and a time machine it before I installed windows on my Mac. When I’ve tried to restart into macOS- It said volume not found. I don’t remember, but it randomly gave me a I don’t remember, but it randomly gave me a EFI password lock .When I put an EFI password lock. Luckily, I have macOS on my flash drive, but I’m scared to check it.
MacBook Pro (2017 – 2020)
If you see a padlock on the screen when trying to access any special startup keys, or when there is no valid bootable volume on the internal drive, then you will need to provide the firmware password to do anything. If you do not know the firmware password, then you will need to be the original owner of the device and provide the necessary & acceptable proof of purchase & personal ID so that Apple or an Apple Authorized Service Provider can remove the firmware password lock.
Set a firmware password on your Mac - Apple Support
EFI firmware lock probably still on flash drive
