Backporting firmware from a firmware series 3 device to a firmware series 2 device will not fix your problem(s) with network access.
Even the most recent series 3 firmwares are out of date with changes that have been made to the world's Internet.
If you need reliable network operation, get one of the much more recent firmware series 5 devices.
Note: You can still use your series 2 devices to read books, so you haven't lost all that much.
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