There is a support page listing the KPI which are deprecated in Catalina and which will consequently prevent loading a kext in Big Sur (https://developer.apple.com/support/kernel-extensions/). I am wondering why one of our kext, a FireWire audio driver, is marked as deprecated. Is has the dependencies defined in its Info.plist as shown below. I can not find any of those listed on the support page. Thanks! Thomas <key>OSBundleLibraries</key> <dict> <key>com.apple.iokit.IOAudioFamily</key> <string>1.1d25</string> <key>com.apple.iokit.IOFireWireFamily</key> <string>1.0.0</string> <key>com.apple.kpi.bsd</key> <string>9.2</string> <key>com.apple.kpi.iokit</key> <string>9.2</string> <key>com.apple.kpi.libkern</key> <string>9.2</string> <key>com.apple.kpi.mach</key> <string>9.2</string> </dict>