RaZberry 7 Pro serial problem RPI4b bookworm

[seattleneil]

Please run the following command: sudo lsof -n | grep AMA0

One possible explanation is that you have 2 z-way-server processes running and they are interfering with each other. Another possibility is you have some other process talking to the serial port. The command listed above will show you if either of these situations exist.

[judge]

Many thanks for your time @seattleneil. It is solved!
I had run

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lsof -n | grep AMA0

before, but without the

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sudo

. And I got an empty return, as expected. However, thanks to your suggestion I run it with

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sudo lsof -n | grep AMA0

and I got

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agetty    23744                             root    0u      CHR             204,64       0t0        134 /dev/ttyAMA0
agetty    23744                             root    1u      CHR             204,64       0t0        134 /dev/ttyAMA0
agetty    23744                             root    2u      CHR             204,64       0t0        134 /dev/ttyAMA0

.
So, I disabled agetty, rebooted and it works like a charm.
I hope this will help others.