Is there any of you got same problem with xperia m2 led bar(not blinking/no bright/totally dead) after upgrading ur 4.3 JB to 4.4.2-4.4.4 KitKat ?here's how to fix the led bar/illumination bar
First, open your sim card slot, find the reset button or find OFF 's text that should be written there.
Then, use a needle to press it and hold it about 10 secs+ and turn on your XM2.
Last, test it by opening any photos in your album app/play a song walkman.
Work on my m2 dual and m2 lte.
thanks to newoo