Try this , what I found in github, catalina almost golden. Big sur cannot boot up.
catalina problems:
1. Audio ALC292 with alcid=12 but headphone static noise. alcid=18, no audio.
2.only got 4K resolution on the 5K screen, which require 2 DP cables connection.
I don't understand why using...
How are you going with installing mojave on dell m4800?
1. If you are facing the usb issues when you installing ,you should try the eSATA/USB port which is on the back of dell m4800.
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