There’s a new firmware available for Apple’s Magic Mouse – but you probably won’t get it

To be totally fair, most of these updates only change the attributes associated with the Magic Accessory, such as color (so the correct video plays inside their System Preferences tab to match the color and revision of your peripheral, which they got rid of anyway and replaced with generic animations in Ventura), layout (in the case of keyboards), and hardware revision (as you know, the 2021 and later Magic Keyboards and Trackpads have more rounded corners and some function keys are different, so the OS has to recognize that, and these updates do exactly that by updating those attributes). The functionality has remained the same since launch, so have the Bluetooth components and all internals basically minus Touch ID in very select models; they are still the same version from 2015, and no updates that address battery life, stability, or accuracy have ever been made. All of these have stayed the same as far as all my tests have shown, and I have each and every single Magic Accessory generation almost, so I'd know; these are rather simple devices after all and all the new logic and changes that has been added over the years like three-finger drag on trackpads and natural scrolling have been done by updating the Mac-side of the equation and not the peripheral itself.