What is preventing the OS reinstall from [link|https://support.apple.com/guide/mac-help/use-macos-recovery-on-an-intel-based-mac-mchl338cf9a8/mac#:~:text=Restart%20your%20Mac.,other%20apps%20in%20macOS%20Recovery.|Recovery Mode|new_window=true]? The model you have should support it. Does it give you an error when you try to reinstall from Recovery Mode? If so, what is the error? Do you know if the device is Activation Locked to an Apple ID?