Remove the battery from the Sun Index device and reinsert it again.
Clear Sun Index from your smartphone Bluetooth device list: – iOS (iPhone): Navigate to Settings > Bluetooth. Bluetooth must be switched ON for the list of paired devices to be displayed. To remove Sun Index, select the circular “i” icon to the right of the QTemp device name. Touch Forget this Device > Forget Device. – Android: From the home screen, touch the applications tab (located on the bottom of the screen). Touch Settings. Touch Wireless & networks. Touch Bluetooth settings. Touch and hold a paired Bluetooth device. Touch Unpair.
Go to Sun Index app, tap on the sidebar button (3 lines on top left) > Settings (gear sign) > Reset > Reset App.