Code:
190421:230118 ota_install: I def:patch:patchinfo="/opt/amazon/ebook/config/netfront.ini":patching file
190421:230118 ota_install: C def:patch:patchinfo="/opt/amazon/ebook/config/netfront.ini":checksum failure
Can also just mean that the file is not the expected version.
From your post, it reads as if you where not following the directions:
https://www.amazon.com/gp/help/custo...deId=201504450
That is, there was no reason to go from version 2.1 to 2.1.1
(PS: Tell us where you got the install package for B004/2.1.1 - post a link if it was not Amazon, with that information it may be possible to spot the exact problem).