All I was saying was those where things to explore.
Which you seem to be doing (I don't have a PW-2 to explore).
That 'exit to login prompt' thing may be the only one we can use (plus the networking stuff).
If 'exit to login prompt' works, we don't need anything else.
(Well, other than 'main' network mounted.)
The KindleTool is easy to learn, easy to use, if lab126 can learn to use it . . . . .
don't be concerned about that, take your time at this.
And if you give KindleTool your serial number - it can also produce your Diags, user: Root login password.
No magic, just experience and everybody has to start somewhere.
Embedded Linux is rapidly showing up in every kind of device, and Kindles are a cheap (un-documented) place to learn.