Not working on 4.2.2 Jelly Bean, Sony Xperia Z Ultra
f.lux doesn't seem to do anything on Android 4.2.2 Jelly Bean on Sony Xperia Z Ultra (C6833)
Also: Do you even support old and outdated Android versions?? I like my Jelly Bean
I believe version 4.4.x and higher is supported, but my device is on 4.3 and indeed does not work.