K3 How to find firmware version from shell prompt

Hi,

I have a K3W.

I know how to find the firmware version when my Kindle is in its normal "reader" mode by going to Home->Menu->Settings. What shows up there is 3.4.1 (2540470001) so I know I have the latest version.

How do I find the same info via a shell session?

I've looked at /proc/cpuinfo, uname, and dmesg but don't see it there.