Recover the Password
Mount the SD card on your PC and edit “passwd”:
$ sudo nano [your path] /etc/passwd
It could look like that:
$ cd /run/media/mycomputer/2f840c69-cecb-4b10-87e4-01b9d28c231c/etc/
$ sudo nano passwd
Find the line starting with “pi”:
pi:x:1000:1000...
Delet the x; leave the colons on either side. This will eliminate the need for a password.
After booting create a new password:
$ passwd