Mac OS 3.4.2 not recognizing any external audio devices

I am a new user(2weeks) have had an earlier version installed on both my Macs and recording and playing beautifully….upgraded 3.4.2 and now neither device recognizes a recording device or playback devise O]I have

  1. Restarted both devices
  2. Verified security/privacy setting
  3. Unplugged the headphone/microphone device and replugged into both devices.

Flat line!
Help…can I downgrade?

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