Solutions
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frauseo's post in Nanopi M4v1 no HDMI output was marked as the answerI have found a viable workaround.
After trying the latest version of Bookworm and Jammy without success, I downloaded the latest version of Focal from the archive and then updated to Jammy from there.
Now I have an up to date system.
I hope this helps others who stumble upon the same problem.
Cheers