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if you lose all the Japanese settings when you jailbreak?
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No. It still as usual. I need to jailbreak to adding Cool Reader
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That is, does it only work for English versions?
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Downgrade or jailbreak? Both of them are done on my Kindle PW2 4GB (Japan)
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Or can you later update again to the newest Japanese version?
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After downgrading to firmware 5.4.3.2 and jailbreaking then you can upgrade newest firmware 5.4.5.1 if you want