Since v5.7.2, each time when there was a firmware update for kindle e-readers, there's always a .1 version for kpw3. The latest is v5.7.4.1. What did amazon do with those 5.7.2.1, 5.7.3.1 and 5.7.4.1 versions? What kind of problem couldn't be fixed after 3 firmware update?
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