Jarkor,If you are testing please put your notes on the bug so we can track progress.Devs don't necessarily check the forums regularly, but we all get a mail every time you comment on a bug so you are going to get a faster reaction there than here.
According to many sites, the min protocol must be smb2
Looks interesting:https://www.riedmann.it/blog/?p=303
max protocol = SMB2