2nd Startup Acess denied

Hi guys i have this problem and i’m going crazy.
after updates and settings on my raspberry pi 3b+ with dietpi when try to reboot and try to login in ssh, it always says access denied.
I don’t have change any password when it asked me. I cant access with any user root or dietpi. Please help me and sorry for my very very bad english.

you could try to reset the password https://howtoraspberrypi.com/recover-password-raspberry-pi/

It works!!! Thanks