Probably meant PW1's firmware 5.4.4.2 aka the one just before 5.6.1.1. But even if "2.4.0" was meant to read as "5.4.0" IIRC that was factory firmware build for PW2. So there is still a dilemma what Kindle model does @scfonta have: PW1 or PW2. Probably PW1 (successful installation of fw 5.4.4.2 points to that conclusion) , and in that case desired/needed downgrade would be to firmware 5.3.9!
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