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Here:
https://support.apple.com/en-gb/HT204904Go to Disk Utility and wipe the disk before you continue with the installer.
Note it may install an older version of MacOS, and you’ll have to find an updater in the Mac App Store.
grams
It's been passed onto me, the HD was/is encrypted, and when I did the set up, I also told it to encrypt it. I have the passwords for both (the previous encryption and the new). Is there any way to just nuke this to nothing/factory settings and start again?