A fully charged battery and the correct firmware is all you need to update your camera’s firmware. And the process is easier than you think.
It is a pity that most people miss the incredible gift that is the custom settings on a camera C1, C2/ U1, U2. They are super powerful tools which can easily.
Lens mount is an interface which helps connect a camera body with a compatible lens. It is what connects the lens both mechanically and electronically..