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Do you have a Kindle Touch or is it one of the newer basic Kindles? That software version suggests a newer 7th or 8th generation Kindle than the Kindle Touch which came out in 2011 (4th generation device) and stopped at software version 5.3.7.3. The 7th & 8th Gen Kindle's didn't require an update like older Kindle's did (the Kindle Keyboard did).
Are these books that might be fixed format of some sort that isn't compatible with all devices? Do they have a "compatible on these devices" list on their Amazon pages?
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