系统是Big Sur 11.6，USB已定制，这个问题只在Big Sur上出现，遇到系统更新会恢复正常，
官网是这样说的： Yamaha Steinberg USB Driver/TOOLS installation on Apple silicon-based MacsBackground
Apple has adopted new security features on Apple silicon-based Macs.
To install the Yamaha Steinberg USB Driver on an Apple silicon-based Mac, the macOS security policy needs to be changed. After that, the driver can be installed using the same procedure as under macOS 10.13 (High Sierra) or later. Please follow the instructions below.
Change the macOS security policy
This is required only if the Yamaha Steinberg USB driver or the TOOLS software that includes the driver is installed for the first time.
Shut down your Mac
"Press and hold the power button until you see "Loading startup options …"
Your Mac will boot into Recovery mode
Click Options (gear icon), then click Continue
In macOS Recovery, choose your account and click Next. Enter the password and click Continue
In the top menu go to Utilities → Startup Security Utility
Select the system on which you want to install the Yamaha Steinberg USB Driver. If the disk is encrypted with FileVault, click Unlock, enter the password, and then click Unlock
Click Security Policy, choose Reduced Security and check the option to allow user management of kernel extensions from identified developers
Click OK. Enter the password for your account and click OK.
Restart your Mac from Apple menu
Install the driver or the TOOLS software package
This is required every time the Yamaha Steinberg USB driver or the TOOLS software that includes the driver is installed.
