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Tried a bit more.
I put completely different image instead of critbatt.png and it turns out that the first squeezed one is 'stuck' somewhere in cache - is still shows up in the same way instead of the new one, only the fist half is visible, but it is squeezed to the whole screen real estate.
I also tried to put a tricky image which has all the necessary information 'squeezed' only to the first half in width, so I thought when Kindle squeeze it again it will look normal. However it didn't work probably due to the suspicion in the previous paragraph.
Any clues where I should look for this 'low power cache' and the reasons why it stuck?
P.S.
Also I am thinking about the case that these folders of 'opt/amazon/low_level_screens/$locale$/600x800/' serve a container which Kindle grabs boot pictures but only for the first time.
A contrary argument is that iterative replacement of 'reboot.png' was always working - I got it working after some trials. So now I am a bit confused.
Would appreciate any help.
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