Yes, that is a great point! I’m in IT so I know technology well. However, I did not think of the Bluetooth chip/version being it. That makes a lot of sense! So at this point – 2 out of 4 timers have been fixed using this old phone. The system is still acting a little strange though. Intermittent dropouts and having to connect via Bluetooth instead of Wi-Fi. But at least this was able to fix 2 of the timers that I am now able to use while I get the other two Warranty replaced (hopefully).