Also if the initial password is still known, you should be able to rename the admin user by importing the conf as well, replacing the value for
HTTPAdminName “NO00999C21B588 dministrator”
Which, by the way, looks like it took the backslash to be the ‘escape’ character so you could otherwise have fun figuring out what the value is for ‘\a’. Maybe it’s taken as 0x0a, or maybe something else. The credential you supply on that page does not need to be a Windows username at all, it’s not used to authenticate but to create a new credential internal to Bare Metal Server.