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I can't remember the OS version but i recall doing something similar a few years back with my brother's university provided Mac. They were bios locked and users had no install rights so I went about fixing that... Removing a RAM stick holding the power button whilst booting would reset the BIOS pw, then booting in terminal mode or whatever it is. Removing some setup file created after the initial boot. Creating a new admin account then granting admin rights to the user account. Pre OS level encryption and all that so not sure if it'd still work... Scary stuff nonetheless.
yeahdext
@Well_is_it
The hilarious thing is that some guy randomly found it two weeks ago and thought it was a feature or something:
https://forums.developer.apple.com/thread/79235
Best 0-day discovery ever.