Need a K3 (AKA Graphite or Keyboard, or 3 gen) to a PW1 for azw3/KF8. The earlier ones don't do azw3 (though the others didn't originally).
Later than PW1 is all KFX.
Probably anything with 2019 or later FW. There probably was never a PW4 that didn't do KFX.
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