We can make a patch or update package that enables 3G, or disables it, as described above.
If you install 3G firmware on a wifi-only kindle, the settings menu "device info" shows 3G even though not present. Not only can we enable 3G if you installed wifi-only firmware in a 3G kindle, but we can also make it "not present" if you flashed 3G firmware to a wifi-only kindle.
The four files mentioned above (including the copies) are the only differences between wifi and 3G, and their file names and contents actually match their function.
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