What do you mean: "an adb shell" on a KT3?
A KT3 runs Amazon/Linux, not Google/Linux (a.k.a: Android).
What do you mean: "dd rootfs and main kernel" ?
I.E: To the kindle storage or From the kindle storage?
If "from" - there is no need, you can download the complete file system image and kernel for the "main" system from Amazon (for any version of customer firmware ever released by Amazon - they are all still on the Amazon servers).
If "to" - What are you trying to accomplish?
There must be a lot to the story which you are not mentioning here.
The Amazon installer does not keep an update log.
Our (that is: Mobileread Package Installer, MrPI) does.
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