The Kindle Keyboard 3 (graphite) can do KF7 mobi or KF8 kindle. FW 3.x.x something.
The KK2, DX (and the DXG which came out after the KK3) are 2.x something and are abysmal for built in fonts and don't do KF8. The Kindle Keyboard 3 / KK3 / FW 3.x.x is a similar user interface to the earlier FW.
All that era need the batteries replaced, but they are available and easily changed.
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