I’m sure I’ve seen videos online about how to connect a 12v supply to the vehicle while changing the battery so all your media centre settings don’t get lost or return to default. It can take an age especially on Lexus/Toyotas to do things like reset the separate tone controls for each mode...CD, FM, DAB, USB, etc. Then there’s sat nav preferences and more. Might be worth having a look but I hope you’re sorted soon.