[Q] How to downgrade HTC One Mini from 4.4.2 to 4.2.2

[schwarzsurfer]

Hello,

I need a little help to downgrade my One Mini from 4.4.2 to 4.2.2. I think I have to flash the old firmware first, is that correct? After that the old recovery and than any 4.2.2. ROM. Will that work? Which files can I use for that?

Thank you!!

Marian