That is incorrect advice. The hardcoded smbclient default dialect is SMBv2, so if you set a range from SMBv1 to SMBv3 Kodi will continue to use SMBv2; it can auto-negotiate upwards to SMBv3 but not down to SMBv1. The ONLY way to use SMBv1 is to set both min/max to SMBv1.
Thanks for the advice. I have an old Zyxel NSA320 NAS, and it only supports SMB1, without authentication. Even if I set LE to SMB1 to SMB1, still I cannot connect to it, and its driving me crazy. Bought a PI400 so I can play H265, and now I cannot connect to my videos. I now watch everything from the drive SD Card where LE is installed on. Any help would be greatly appreciated. Tried NFS, as my NAS supports it, but cannot find the way to set it up.