Quote:
Originally Posted by Ruskie_it
Maybe not the right place to ask, and maybe it isn't even easy/possible for you to answer, but how/why the new firmware makes this jailbreak no longer viable?
If it is too off topic then never mind. 
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Not hard to answer, in fact, you can see for yourself how the (prior-to recent firmwares) JB does its thing by looking at the filenames of the files you copied to JB the Kindle.
See that one with the very strange name?
The one whose filename looks like a shell command?
Guess what, it is.
What in the *nix world is called a: "poison filename".
The most recent versions of the series 5.x firmware goes through a filename check and rename process that avoids letting the shell actually execute the filename.
Which is actually more convoluted than the system built-in method of avoiding poison filenames - but we have stopped giving Lab126 Linux lessons.