DO NOT run the factory-use-only firmware build after you finish jail breaking.
It was never intended to be used 'in the field' by customers.
Install one of the versions of customer firmware builds.
See: Current jail break, step #7, open spoiler.
All of those could be jailbroken again if something went wrong during your testing.
There are new firmware versions than those I list.
But there has never yet been a 5.9.<anything> for the e-ink Kindles.
5.8.9.0.2 was the previous 'current' firmware and I think your '.8' pair of keys is not working.
Those version numbers use periods as field separators, not as decimal points, it isn't a floating point number. (Amazon is the only people I can think of that uses five fields. The rest of the world gets along with only three.)