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Seems my question was a bit TL;DR. Are Kindle firmware updates, particularly for the K3, now done via 3G as well as the other methods, and if so when was the change? It wasn't always like that, in that they were restricted to Wifi and manual installation. I have a K3 that has got the latest firmware (3.4.2), but I have never connected it to Wifi and the last manual update that I did was version 3.3 a few years ago.
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