kn320 not connecting to bluedio headphones

Bought kn320 to bridge the connection of jackaudio and bluetooth headphones. They are compatible as of characteristics. But the problem is that kn320 only blinks once with orange light upon powering on sequence. After that it doesn't blink orange even once. Orange light means "receiver connecting".

Question by TheK0tYaRa on Super User, licensed CC BY-SA. We show a short excerpt and link to the original thread as credit.