You need to make sure there are no other devices operating in the Bluetooth range of 2.4ghz. Items like other cell phones, iPads, etc.....anything that could possibly cause interference with the Bluetooth connectivity. Even other items like a laptop, Bluetooth headset, etc will cause problems. The AMPLIFii TT can only accept ONE device via Bluetooth. Next make sure the "FLASH" update has been made to the AMPLIFii TT which I believe is now 2.50.2 and the APP is 2.50. Also, I'm not sure how your updating these devices, (Windows computer, etc) but you have to use the correct download/update utility to "FLASH" the AMPLIFii TT. Meaning if you using Window 8.1 then use that utility, if Windows 10.X then use that utility, otherwise I believe the update will fail. Beyond that you would have to contact "TECH SUPPORT from LINE 6" possibly via a "trouble ticket". Hope this helps some. I know how frustrating it can be.