I don't really know what Amazon has planned. My K3G only had the two files modified last October except the 3.4.2 already had TLS enabled so the needed changes could be minor in that case. I am not even sure the October update is the same as the critical fixes needed before Amazon breaks things in March.
Maybe there are more changes planned including TLS for the older kindles including the DXG except I am doubtful.
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