Quote:
Originally Posted by DNSB
Currently, Amazon does not supply KFX format ebooks using the Download & transfer via USB so the age of your Kindle does not matter.
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If the ereader is a DXG or older than Kindle Keyboard 3rd Gen, then you would get only mobi/azw/KF7 rather than the better KF8/AZW3 (when available). The Kindle Keyboard 3rd Gen needs to be updated to last FW, or at least not original as originally it didn't support azw3/KF8. All later models except the DXG do (The DXG is really a DX with updated screen, hence though it was released between KK3 and next 6" Kindle, it's older firmware and design).