Ok, I've installed the new 5.2 release and found a bit of a problem with migration (no python 3 yet).
During this migration Step:
If any of your type's title has special characters (e.g. Seleção), migration will fail with UnicodeDecodeError.
My solution was to leave the title without special characters in order to finish the migration.
So I guess this post is just an FYI if someone ran into the same problem.