Park assist and stereo have broken due to replacing the battery. What's the fix?

Thanks, but the car was not jumped. The battery was simply replaced due to normal wear over time. Could it still be a fuse problem?

Yes . But the car needs power until you replace the battery because some system will throw trouble codes and they go to fail safe mode that needs to be reset.

It depends on how the battery was installed. It could still have a blown fuse or fuses. Don't worry about resetting the car. On this platform vehicle when the battery is disconnected it will erase all fault codes that would be intermittant or caused by the battery low voltage at the time it was replaced. If there is a permanent fault somewhere it would still store the code until it is resolved. It is very likely the repair is very simple and resolved easily.