Hi there! I understand you're having trouble with the Letsfit app not recognizing your email after an update, and the app might also look different. Let's work through this together.

First, can you confirm if the email address you're entering is the same one you used to register originally? Sometimes after updates, the app might be a bit picky about matching the exact email.

Meanwhile, let's try a few steps that often help in situations like this:

1. Restart your iPhone: Sometimes a simple restart can clear minor glitches.
2. Check that the app is fully updated: Go to the App Store and confirm that you have the latest version installed.
3. Logout and Login again: If possible, try logging out and then back in, or uninstall and reinstall the app to refresh its data.
4. Clear cache or app data: On iOS, you can uninstall and reinstall to effectively clear the app's cache.
5. Ensure App Permissions: Go to Settings > Letsfit and ensure the app has permission for Bluetooth, Location, and Notifications, as these sometimes are necessary for proper syncing.
6. Try alternate login options: If the app supports login via phone number or social accounts, try those if available.
7. Check if the email is registered: Sometimes emails can be mistyped or alternate emails used, so try if you have used any other email accounts previously.

If after trying these steps your email is still not recognized, it is possible the update caused some issue with account linkage. In this case, could you please tell me the exact message the app shows when you try to log in? That will help me narrow down the cause.

Also, have you tried resetting the password using the email you are entering? Sometimes this can confirm if the account exists in the system.

Let me know what you’ve tried so far and any error messages you see, so I can help you better.