Hi jackedupiphone
Welcome to the Apple (user-to-user) Community.
Am no expert, yet your post surely deserves a response. Once a discussion is under way, perhaps others with the right experience may join.
Wondering which MacOS is / was installed,
and
if any of the articles listed here can be of help:
Eg: you may want to browse through this article:
If your Mac starts up to a question mark – Apple Support
To prepare a Mac for a new owner or new role:
What to do before you sell, give away, or trade in your Mac - Apple Support
You might want to browse: Eg: Step 8 "Erase your Mac and reinstall macOS"
________________________________________________________________
For obtaining various older versions of Mac OS ... there are links provided in this article: How to download macOS - Apple Support
and
Identify your MacBook Pro model - Apple Support
says:
MacBook Pro (Retina, 13-inch, Mid 2014)
Model Identifier: MacBookPro11,1
Part Numbers: MGX72xx/A, MGX82xx/A, MGX92xx/A
Newest compatible operating system: macOS Big Sur
All the best :-)
