(In the following explanation, dialogs shown during the installation of the TOOLS for UR-C are used as the example.)ġ. This is required every time the Yamaha Steinberg USB Driver, the Yamaha Steinberg Thunderbolt Driver or the TOOLS software that includes the driver is installed. Install the driver or the TOOLS software package Enter the password for your account and click OK.

Click Security Policy, choose Reduced Security and check the option to allow user management of kernel extensions from identified developers.

If the disk is encrypted with FileVault, click Unlock, enter the password, and then click Unlock

Select the system on which you want to install the driver.

In the top menu, go to Utilities → Startup Security Utility.

In macOS Recovery, choose your account and click Next.

In macOS Recovery, select the volume on which you want to install the driver and click Next.

Click Options (gear icon), then click Continue.

Press and hold the power button until you see 'Loading startup options …'.

To install the driver or the TOOLS on Macs with Intel processors, please skip this section and go to 'Install the driver or the TOOLS software package' This is required only if the Yamaha Steinberg USB Driver, the Yamaha Steinberg Thunderbolt Driver or the TOOLS software that includes the driver is installed on an Apple silicon-based Mac for the first time.

After that, the driver can be installed using the same procedure as under macOS 10.13 (High Sierra) or later. To install the Yamaha Steinberg USB Driver or the Yamaha Steinberg Thunderbolt Driver on an Apple silicon-based Mac on macOS 11 or later, the macOS security policy needs to be changed. Apple has adopted new security features on Apple silicon-based Macs.

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