The Boot Camp Support Software was a critical tool for Mac users who wanted to run Windows on their computers. It allowed them to seamlessly switch between operating systems, and the new update promised to make the process even easier.

Open Boot Camp Control Panel → Keyboard → Enable “Turn on keyboard backlight when the computer is in low light.” Ensure the ambient light sensor is clean.

A niche but annoying bug: Windows would turn off the Magic Keyboard backlight after 2 seconds of inactivity. Build 5621 introduces a registry fix that allows the light to stay on for a user-defined duration.