And even if there where an earlier firmware version for the PW-3 (or, KT-2 which I think is the model the O.P. meant) - - -
You would have to jail break it first, before you could downgrade it.
= = = =
Note:
There are threads here in addition to the sticky one that provide other information.
Such as: How to make the serial port connections without soldering skills.
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