ULPT request: 'Jailbreak' laptop provided by old employer

I finished a role at a company last year, and they have not asked for their laptop back. They have moved onto a newer model for new employees anyway, so idk what they would do with this one.

Anyway, I really like this laptop, but it is restricted in terms of 'certain functions are controlled by administration' or similar, so I can't have admin access, or log in to a new OneDrive etc. I can't even install apps outside the company's set (although to be fair, it is quite an extensive set). Does anyone know if there is a way around this?

I'm semi-computer competent, I can kind of code. I'm happy to factory reset as part of the process if needed.

Tia x

Edit: pls don't downvote people genuinely trying to help (unless it's blatantly stupid, then go ahead)