Yeah, thought this terminal commands route was a long shot given how he was coming from a previous non-M1 Mac and Catalina. I am glad to be back up and running with my 3G under Big Sur! It worked for me, which made me think the leftover kernal extensions were the problem going from Catalina to Big Sur. If Desktop Video then says "No Desktop Device Detected" you have to go to System Preferences>Security & Privacy>General and the select "App Store and identified developers” and then “Allow” Blackmagic Design in the pop-up window. Open Terminal to enable SIP: At the prompt enter this command: csrutil enableĩ. After deleting the extensions, I rebooted in Recovery Mode (command-r)Ĩ. Sudo rm -rf /Library/StagedExtensions/Library/Extensions/BlackmagicUsbIO.kextħ. Sudo rm -rf /Library/StagedExtensions/Library/Extensions/BlackmagicIO.kext Sudo rm -rf /Library/StagedExtensions/Library/Extensions/Blackmagic_Multibridge_Driver.kext In my case, the commands looked like this for the three extensions: Once you reboot, open Terminal and force delete the kernal extensions. You will get a message that SIP has been disabled.Ħ. Open Terminal to disable SIP: At the prompt enter this command: csrutil disableĤ. Uninstall Video Desktop using the uninstall program.ģ. Once I did all of this and then installed 12.0b1, it WORKED! Desktop Video recognizes the recorder and the picture displays correctly in OBS, using either SDI of HDMI.ġ. To do that, you have to boot into recovery mode, disable SIP, force delete the kernal extensions, then reenable SIP.
So, I thought about getting rid of those. Then I noticed that the uninstall left 3 kernal extensions on my system: I completely uninstalled several times and reinstalled, but it was still the same. I tried installing 12.0b1 and got the same thing.
The recorder was recognized, but all I saw was a black screen in OBS. I experienced the same issue as everyone else.
I had Desktop Video 11.7 installed on Catalina and then upgraded to Big Sur. MY SOLUTION - UltraStudio Recorder 3G and Big Sur
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