I wonder if it might be possible to avoid automatic updates by filling the Kindle with so much data that the remaining capacity would not be enough to download any updates. For example, the current update is 177 MB. If I fill it with enough data to leave only 150 MB free, that would still be enough to add new books, documents etc. but should avoid the update. Untested, but an idea for those who don't want to give up WiFi functionality just to keep version 5.4.0.
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