Quote:
Originally Posted by Quoth
The K3 is actually the oldest for azw3/KF8, and didn't read them till a backport firmware was available. ...
The PW3 got FW update for KFX. I don't know which older Kindles don't do KFX, but K3 doesn't.
KFX covers multiple formats internally.
Dual Mobi is mobi KF7 and azw3 KF8 in one file. It does seem to work at least on a DXG (gets mobi version). The K3 Aa menu seems to select original mobi (any not Publisher option) and azw3 in a dual mobi.
Any Kindle without a Publisher option in Aa is old mobi only.
The PW3 I have seems to ignore the old mobi in Dual mobi even if Publisher isn't selected in Aa, but will display actual old mobi.
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Apparently my Kindle Keyboard is working the same as yours. (At least I think it is. I know there is no Publisher selection, but I think I have the newest available firmware installed.)