I have a 20s that when I purchased new with V1 firmware worked out of the box well. I saw there was a firmware upgrade to 1.6.1 and I took it. Unpaired from iPhone then it would not connect. Performed a factory reset and phone paired/worked fine. I recently saw a firmware upgrade 1.6.2 and decided to upgrade. Unpaired device from phone then... when pairing again, the phone would not recognize. It would allow me to select the device 3 times and for three attempts I get, "device not supported" then "device unsuccessful connection".. iPhone is using 9.3.4 version.. Now what is funny is if I have my cell on, and put 20s into blue/red paring mode, it will connect to phone only as "Media" and I can listen to music from phone but I can not make a call. Turning the sena off / on I get Media connected instead of phone connected. I tried doing phone pairing using phone button but it too failed.
20s Not recognized by Iphone