Xtool V401 OBD2 scanner login failed when updating, xtool.co.uk engineer offer the solution in this article.
Please have a try xtooltech_upgradetool_v2.0.57_setup_en.exe:
https://mega.nz/file/kdhk0QCA#SOhTWlZtPdb5wJNhw1uBJ_J7pKKxKyRa0MYziNMfj9A
Xtool V401 OBD2 scanner tech support: https://www.xtool.co.uk/