Downgrade Z3 compact (and others) from Lollipop to KitKat

Does anyone know of a method to downgrade it to 4.4.4? I don't like Lollipop.
Thanks.
 

You can either check XDA for a firmware or make your own for manual flashing
Guide to create your own generic .ftf firmware file for your country
The Flashtool link in that guide is old so use the new one here
Follow this guide to manually flash but use the .ftf you created above and not the one listed - Everything else is the same for all Xperia devices

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    Craig Nowak wrote:
    >
    > I have recently installed 6.0i and want to continue development of the
    > system I started on 4.1. The system is much, much slower on 6.0i and
    > acts differently then on 4.1. A quick(hopefully) overview of the
    > system:
    >
    > I'm using a PC-DIO-96. The system consists of three main VIs. 'IO test
    > Program.vi' is the user interface and takes care of calling the other
    > VIs and displaying the results. 'init pattern check.vi' is the first
    > part of the test. It will receive a walking 1's pattern from the
    > outputs of the UUT. It compares it with a spreadsheet file and
    > verifies that the outputs of the UUT can be used for the second part
    > of the test. The outputs from the UUT are simulated from a pattern
    > generator within 'init pattern c
    heck.vi' and looped from port 3 to
    > port 0 physically, as the UUT is not available yet. The second part of
    > the test is done using 'command mode.vi'. It receives a 8 bit number
    > from the UUT (also generated by the program itself for now) and
    > de-multiplexes it to the 64 output bits which go back to the UUT. The
    > command FF means the test was successful, FE is a failed test. These
    > can be generated as well to simulate.
    >
    > Okay, now the system ran fine on 4.1. My test pattern could go as fast
    > as 7 ms with a timeout of 500ms in the sub VI, or if I ran it from the
    > top VI, it would need to be 5000ms to be reliable (unless the sub vi
    > window was open in the background, then 500ms worked as well). When I
    > converted them to 6.0i, the warnings I received all concerned data
    > range coercion, which I didn't know I was using, so it shouldn't make
    > a difference. The system now runs extremely slow. Just changing from
    > the front panel to the block diagram takes about 4 seconds, where
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