Hello again.
Thought I would share my progress so far.
This might help other people with similar issues.
I would also like to thank everybody that helped here.
My current setup:
Fritz!Box 4040 router with the latest BETA firmware (7.24)
Fritz settings: SMBv1 disabled
Two USB hard disks plugged to the router / used as sources in Kodi / CoreElec
All my devices have static IPs, assigned via the router’s network settings.
Box: Mini M8s II (905x, 16/2GB)
CoreElec 9.2.5 (non -ng) / installed in microSD card
Kodi SMB settings: min SMB2, max SMB3
Sources.xml and Passwords.xml files edited to add manually the sources paths with the IP of the router (instead of the Name) + username and the password that SMB2 requires (as browsing is not allowed). Library was cleared before I applied the new .xml files.
Some notes:
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the mystery with the advancedsettings.xml file has not been solved. Eventually I had to delete it, for everything to work. Otherwise most of my video files were just not playable. The system would even hang some times with that file in place. I tried various versions of it without success. Still makes me wonder how come the .xml file did not cause problems with the current / older stable firmware of the router, but brings up huge issues with the new BETA firmwares (that will become official soon).
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the “the destination may not be writable” error was probably due to my mistake of forgetting to edit a path in which I have set the “Backup” add on to keep automatic backups of a few files, just to keep alive one of the hard disks that goes to sleep mode and caused issues in the past.
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so far this setup seems to work. I wanted to move from SMBv1 to SMB2 / 3 and make use of the new (BETA for the time being) firmware of my router that now supports these SAMBA versions. I’ll keep testing this and get back if anything worth mentioning arises. Let’s hope that this setup will work without any more issues.