Reboot And Shutdown Problem On Asrock Boards With b550m Chipset

The Problem:

When you shut down or reboot your system from within macOS (by pressing the shutdown or reboot button), the system gives you a black screen on the next boot, and you have to perform a power cycle to fix it. I noticed the CPU and RAM red lights on the B550M Pro4 motherboard.

What Causes This? The issue is caused by the USB LED controller on these motherboards.

How to Fix It: There are two possible solutions:

1. For users who have already mapped their USB ports:
   • Reopen the USB mapping tool, go to the option S. Select Ports and Build Kext.
2. For users who haven’t mapped their USB ports yet:
   • Go to option D to remap the ports.
   • Then once finished press B to back and go to option S. Select Ports and Build Kext.

Once the USB ports are displayed, search for the port with the LED controller connected to it like in this picture

https://preview.redd.it/f4yqh3rqgzpd1.png?width=817&format=png&auto=webp&s=ad3b2a58b8f2bdfc3f5bb2d9f1010a2fa6c037a8

Once you've identified the correct USB port (for example, port 12), and it’s marked green (meaning it will be mapped), type the port number and press Enter. The port should then change to white.

https://preview.redd.it/rjc3bmgxgzpd1.png?width=518&format=png&auto=webp&s=532bee7138216922a01f74358aa576860e7b8d47

After this, go to option K. Build USBMap.kext to build the new kext and place it in your kexts folder.

Don't forget to press Ctrl + Shift + R in your config.plist to refresh the kexts.