How do I fix a b4 error code on a MSI z690 force motherboard?

[Groggy_Gary]

Recently finished building my computer, It booted into the bios, code Ab, so I plugged in my mouse and keyboard and the motherboard code b4 came up and even after unplugging them b4 still hung, I looked in the manual and its for "usb hot plug". I re plugged in my usb connectors (3.2 gen 1 and 2) and got the code again, plugged them into my motherboard usb rather than my case usb and still got it. 

 

Even with the b4 error code the mouse an keyboard still work fine.

 

I've been sitting on an msi support ticket for 3 days with the only answer being "what's your bios version" (which I already provided), tried the live chat and just got redirected to the forums (0 results) I asked reddit, and got nothing

 

Is there a fix? should I just ignore it? is this normal? I've had my pc build for the last 4 days.

[Levent]

Not an error code.

Spoiler

 

[RONOTHAN##]

32 minutes ago, Groggy_Gary said:

is this normal?

Yes. Just checked on my Z690 Unify-X, it does the same thing when hot plugging USB devices in BIOS. 

 

Just install Windows and enjoy the system. 

[Groggy_Gary]

I knew i could trust linus community tysm