BIOS M6500RC version 316 breaks OS boot using USB4

[alixolix]

Hi,

I have a problem that ASUS-Brazil can't help me. First of all, I use Windows and Ubuntu, Windows is installed on my internal SSD, Ubuntu is installed on external SSD accessed thorough USB4 dock. Unfortunately I had a bright idea :'-( 😭 ... I updated my laptop BIOS to the latest BIOS version, 316, after that I can't access my OS on my USB4 Dock anymore, I can access using USB3.2, but I lose bandwidth compared to USB4. ASUS-Brazil can't help me, even doesn't have access to ASUS development team to tell them to investigate or to make an opinion or suggestion about that. I attached an image with my setup and the message error. Please, can anyone help me?

[Falcon_ASUS]

@alixolix 
I will forward your report to the technical department to verify if there are any differences between the previous BIOS version and the current version. If there are any updates, I will get back to you immediately. Thank you.
 

[alixolix]

Unfortunately, I don't know the previous BIOS version. I've even tried to force downgrade, but BIOS didn't allow. I use a mini cable type-C to type-A and connect to the USB 3.2, the photo provides visualization of the cable and the connection. Using Ubuntu through USB 3.2 until now works without any problems, the unique downsize is to lose USB4 bandwith, 40gbps dropped down to 5gbps.

[Falcon_ASUS]

@alixolix 
Please go to the BIOS and set both the Fast Boot and Secure Boot Control options to Disabled. Then check if the issue is resolved. Thank you.
[Notebook] How to disable Fast Boot in BIOS configuration
How to Enable/Disable Secure Boot

[alixolix]

Sorry for the delay, I tried it, but unfortunately this doesn't work.    

[Falcon_ASUS]

@alixolix 
I have forwarded the information to the relevant department.
We will keep you updated and your consideration will be very much appreciated.