Thanks for your detailed clarification! BootChamp executes exactly that bless command you wrote. That works pretty well with disabled SIP. The problem is that Apple hasn’t developed an APFS driver for Windows. So the „Restart in OS X“ function does not work as stated in this support article: https://support.apple.com/en-us/HT208123 Apples workaround is to use the ALT-key method, but this does not work for me, because I have a PC graphic card and cannot see the boot menu. Do you mean the info.plist file for the Bootcamp App in macOS? There is also the Apple Software Update Tool in Windows, which should search for Bootcamp/driver updates. In the past I used a MacBook Air 2014 to get the driver for the Magic Trackpad 2 and Magic Keyboard, because these drivers were only rolled out via this mechanism and are not included in the Bootcamp Driver USB Stick.