You'll need to call (by phone) Dell support -- upon verification of ownership, the'll issue an unlock password.

Thanks to you.

I've tried that but it a'int working for me anyway.

Did you push Ctrl+Enter when typing the generated key? On these newer dell's it won't work unless you press ctrl as well.

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@elpro99dell wrote:

https://www.passmoz.com seems to work on every Dell laptop I have owned you could try it.

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This works most of the time but failed sometimes. If it was the case, then you can use PassMoz free tool do reset the password.

The Ctrl + Enter was the ticket!  Thank you!  

TY! Remind: BIOS kezboard lazout is qwerty ;-)

This helped me too. Had the wrong code entered before, thinking it was a service code or something. But the code was in the box right above the password entry box. So I tried generating with that code and found myself unsuccessful typing another set of like 9 different passwords. It wasn't until I saw your post that I decided to give it a try with the CTRL+Enter, and I was able to get in using the "Dell from serial number" password with a CTRL+Enter!

anyone with solution on dell latitude E7440  ?

Worked for me !