Hello
From the output you pasted, it appears that you are trying to reset passpword at U-boot prompt( => )
Password recovery has to be done at loader prompt( Loader>
).
Press space bar after U-boot is loaded.
(Basically you would be asked to press space bar twice, first time to get into U-Boot, second time to get into Loader)
Hope this helps!
Regards,
Raveen