3G Monitor / Recorder - a permanent solution on macOS.

I posted this as a reply on another thread but thought it might be better to post it under its own topic.

I suffered the same problem as many others where the 3G Monitor nor Recorder was visible and detectable in the Desktop Video Setup or Resolve. This was on my M1 MBP only, but all worked on my M1 Mac mini, both running macOS Sequoia 15.1.1

Uninstall, reboot, reinstall, authorise the Extension in macOS, did still not result in Desktop Video Setup identifying the 3G Monitor/Recorder.


Running this terminal command showed that macOS itself identified the Extension.

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systemextensionsctl list

Running the terminal command showed that the DesktopVideoUpdateTool can see the Monitor/Recorder device.

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/Library/Application\ Support/Blackmagic\ Design/Blackmagic\ DeckLink/Desktop\ Video\ Updater.app/Contents/MacOS/DesktopVideoUpdateTool -l

Kickstarting the DesktopVideoHelper did manage to get the Desktop Video Setup to suddenly identify the device. But after a disconnect and reconnect it still did not show anything so something did not properly launch in the background.
viewtopic.php?f=3&t=189485&p=991646

Looking at the Activity Monitor on my Mac mini, showed that the process

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com.blackmagic-design.BlackmagicIO.DExt

appeared everytime I connected a device and disappeared as soon as I disconnected it.
So it was obvious that something did not launch or launch or initiate as it should.

This is what I did to get it all working on my MBP:

1. Removed the "Blackmagic Desktop Video Driver Extension" under the Driver section.
Click the three dot button and choose "Delete Extension"
https://support.apple.com/en-gb/guide/m ... usr003/mac

2. Some of these Agents and Daemons was not properly deleted during the Unistall.
So I manually delete the LaunchDaemons and LaunchAgents
/Library/LaunchAgents/...
com.blackmagic-design.DesktopVideoUpdater.plist
com.blackmagic-design.DesktopVideoDriverExtension.plist
com.blackmagic-design.DesktopVideoDriverExtensionRemove.plist

/Library/LaunchDaemons/...
com.blackmagic-design.DesktopVideoHelper.plist
com.blackmagic-design.DesktopVideoDriverExtension.Helper.plist

3. Ran the Uninstall Desktop Video.app

4. Rebooted

5. Reinstalled Desktop Video Setup 14.2.1

6. Reboot and Authorised the Extension (or if it was the other way around)

7. Launched Desktop Video Setup

8. Connected the 3G Recorder and after a few second it was identified by the Desktop Video Setup
Disconnected it and tried the 3G Monitor instead and with a few seconds the Monitor device was identyfied as well.

Hope this might help others in the same frustrated situation.