I installed macos on external disk with usb, and then I installed Yamaha Steinberg USB Driver, got a System Extension Error, I Open Security Preferences and allow Yamaha Corporation Extension in Security & Privacy window, restart but still not work.
MacOS version: sequoia 15.5
Hardware Overview:
Model Name: Mac mini
Model Identifier: Macmini9,1
Chip: Apple M1
Total Number of Cores: 8 (4 performance and 4 efficiency)
Memory: 16 GB
System Firmware Version: 11881.121.1
OS Loader Version: 11881.121.1
Activation Lock Status: Enabled
Steinberg UR22C:
Default Input Device: Yes
Default Output Device: Yes
Default System Output Device: Yes
Input Channels: 4
Manufacturer: Yamaha Corporation
Output Channels: 2
Current SampleRate: 44100
Transport: USB
Input Source: Default
Output Source: Default