You can always try Admin Reset which can reset the username and password for you. See https://soetemansoftware.nl/blog/umbraco-admin-reset-14 for more info

Best,

Richard

One possibility: Umbraco 7.7 introduced a new user management system, and some of the defaults changed at that point.

Specifically, it expects users to log in with their email instead of their usernames.

You can try either a) logging in with emails or b) updating the umbracoSettings.config file to switch it back to using usernames:

<security>
    <!-- set to true to auto update login interval (and there by disabling the lock screen -->
    <keepUserLoggedIn>false</keepUserLoggedIn>
    <!-- by default this is true and if not specified in config will be true. set to false to always show a separate username field in the back office user editor -->
    <usernameIsEmail>true</usernameIsEmail>
    <!-- change in 4.8: Disabled users are now showed dimmed and last in the tree. If you prefer not to display them set this to true -->
    <hideDisabledUsersInBackoffice>false</hideDisabledUsersInBackoffice>
  </security>

Just change usernameIsEmail to false and that should restore username log ins.

none of this worked, i have changes the password by an example from this site: http://jondjones.com/learn-umbraco-cms/umbraco-developers-guide/umbraco-troubleshooting/reset-your-umbraco-7-password-manually-via-the-database

it worked, but after the update the content menu was missing and i got 404 message.

That's a big update - I'd also confirm that all config files were merged correctly, and clear localstorage/cookies too

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