My jabra blutooth won't work on Skype, WhatsApp, Viber,... Or any other apps!
Its just work on normal call.
There is no problem to talk with these apps when I use wire handsfree.
Try booting into Recovery Mode and wiping the cache partition, which won't erase any personal data. Follow the steps in this video, but instead of selecting Wipe Data/Factory Reset, make sure to select Recovery, and then look for a Wipe Cache Partition option. After the cache is wiped, Reboot System Now. No personal data will be lost.
Ugh--sorry, I thought I had seen a Recovery option in one of the videos I was looking at. In that case, the stock bootloader doesn't allow you to get to Recovery. Not sure what else to try at this point ...