KUAL supports firmware version 2.3.5 and newer (which, as you point out, includes series 4 and series 5 firmwares).
I.E: it will run on all models **except** the K1 and very old series 2 firmware (K2, DX, DXG that have not been updated).
There are two (2) KUAL applications because Amazon changed the libraries during product evolution.
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