(1) Make sure Bluetooth is enabled in your iOS device. (2) Make sure your CT3 is within connecting range of your iOS device. (3) Before set up, reset the device by long pressing the button for about 10 seconds until green LED blinks 3 times.
(1) Please check the battery level. Make sure the battery level is higher than 5%. (2) If CT3 is under BLE5.0 connection, the range is limited to BLE range only. So if BLE connection is poor, please consider setting up a Thread network for CT3. (3) If the connection of CT3 and the Thread network is too weak, try putting a Thread router to improve the Thread connection.
(1) A red dot on the CT3 icon in the Onvis Home app means a newer firmware is available. (2) Tap the CT3 icon to enter main page, and then tap the upper right to enter details. (3) Follow the app prompting to complete firmware update. Do not quite the app during firmware update. Wait about 20 seconds for CT3 to reboot and reconnect.