I too just returned to using Kindle. I started out with a K2 then drifted over to the Sony readers (505, 300, 600, and 900). Sony never updated the firmware for any of their readers while I owned them. But Amazon is known for updating their firmware fairly often. With Sony expect your firmware to be something like version 1.00.02. With a Kindle DXG I think it is firmware 2.5.5. I'm totally confident in Amazon's commitment to keep their released hardware up to date.
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