I exported my database from 4.0 beta3 and imported to 6.49.6 CHR. The new version isn’t starting and I can’t figure out where to go from here:
[admin@MikroTik] > /dude import-db backup-file=dude/dude-backup-2022.08.17.tgz
status: enabling back after import: cannot read database
[admin@MikroTik] >
Expanded the disk space from the initial 64MB size to 2GB. Import was much more successful, however the database stops after about 10 seconds:
[admin@MikroTik] >
19:14:13 echo: dude,critical db failure: database or disk is full
[admin@MikroTik] >
Any thoughts here?
It’s better if you start from scratch.
There are so many differences, that even I had tried (successfully) to migrate the database,
BUT there were so many problems, not immediately visible,
that after some time constantly looking for where the errors were,
I started from scratch , and now it works perfectly.
In summary: You better start from scratch, it will take you less time than constantly looking for problems and banging your head to solve them.
Yeah, I’m starting to get that vibe 
thank you for reaffirming it.