I have new MP3 400s 2023 and decided to install CarPlay for GPS and music .Piaggio maps are so poor and also screen of the phone need to be vertical only.So, bought CarPlay display 7 inches .
Also decided to remove USB plug and put standard 12 v cigarette plug .I was looking everywhere , but was not able to find out how to disassemble front pannel to get access to USB plug from inside,
I actually disassembled more than necessary until realized how to get access.Thisnis why I decided to post it for others who same as me never opened any panels on MP3
Remove 2 screws under black insert and remove this insert.
Remove 4 screws for windshield and remove it.
Now gently pull black plate from the bottom and it will go out from clips.
now you can unscrew pannel under windshield and will get access to internals.
I removed usb plug completelly, made little bit wider the hole and put standard 12v plug.
I connected to same connector as it was befor for USB and also added power cable for CarPlay.
See photos below.
Hope will be some help for some people
Re. CarPlay
Screen not installed yet and will post in few days