I have an pi3 working with a raspbian stretch.
I must migrate the full system to a pi4b.
I have copied the sd of pi3 (both the partitions) into 2 file with 'dd' in hd
of my pc (debian).
After, I have create the 2 partitions into a new sd card (same model) and
copied the 2 image-files created before.
Pi4 not work!
Must I install a new image from repo (raspiann buster) and re-install,
recompile all my software and reconfigure all?

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