First, if the beats sounds like poop, be aware there is a dealer only set of firmware that can fix the issue.
OK, the 5.0 head unit controls a bunch of stuff. Nobody to date has claimed to have successfully replaced it without issues.
If you aren't able to tell me how to make it work and are looking for a road map, you probably should not touch the head unit at this time. Feel free to disagree with me, it's your bank account.
It's a lease. You are not legally permitted to change anything on the car as it is not yours. Putting it back exactly as it was may not get most people in trouble, but that's not the terms of the lease, and if you run into a situation that you can get caught out messing with the vehicle like that, it can have a negative impact on you. How much really depends on the situation.
What you can do technically:
Replace the speakers. Just match the impedance, which for the 9 speaker setup is 4 ohms dash, 2 ohms door. It's really not oging to leave any marks other than the only 2 ohm speakers are made by harmon and are "plus sized" so the holes don't line up. Only three will go back in and you'll have to save the screws for the lease term. It is unlikely a lease return inspection would even care as long as the speakers function and there's no reason to examine the doors internally.
Replace the speakers and bypass the factory amp. Get the right harnesses and hook up some resistors of the right load in the right place, and you can run lots of wattage, a bigger sub, and can run whatever impedance you design the system for. This involves rewiring the car, and will likely, if done as well as can be, result in at least something being cut to run wire from the battery through the firewall to the amps. Will they care? dunno. Will they care if you leave it in place on return? yes.
Swap out the head unit using a magic black box. So far I have seen one person try it and it only kind of works. If the renegade software was stable and unchanging, it might be worth it, but given the frequency of flash updates, it sounds like a giant PITA.
Swap out the head unit for a "compatible head unit" If you have the money to lead form the front here, go ahead. I don't think you'll be upping quality given the no-name nature of the two available ones, and I would expect zero support on them. At least in English. I've seen one person claiming to go this route, and zero results.
I have yet to see a real installer or owner say you can, I've seen a lot of products that claim you can wit their product. This isn't mixed signals. The only confusion is if you want to believe unsubstantiated advertising with no proof that anyone has used that product successfully.
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