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It is unclear what 'password(s)' you are writing about.
The ones that are part of the system from Amazon or the ones that are a part of the USBnetworking package (which on a K5 would be ssh and telnet).
That is; you have mixed references to both in your post.
Amazon provided, system image, password(s):
In the 'main' OS - all password usage is disabled (has been for years).
In the 'diags' OS - that is the system your serial number based password should work on.
(The Kindles in the 5.x firmware series are all dual-boot systems - or dual-systems boot, your choice of term.)
The add-ins behavior added by the USBnetworking package (and option file left untouched):
The 'main' system:
ssh over USB cable : no password required.
telnet over USB cable : no password required.
ssh over Wifi (normally not a default option setting) : password required
telnet over Wifi (normally not a default option setting) : no passord required (its telnet).
The above applies only if your running DropBear (the provided default), if instead you have set the options to run OpenSSH, it always requires a password.
The USBnetworking package provided sshd and telnetd have been modified to use password file(s) from visible USB storage, not the system image files.
There is no ssh access to the 'diags' system unless you have installed RP (Rescue Pack).
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