Please try one of the following options:
1. When the earbuds have connection records with multiple devices, they will prioritise reconnecting to the last connected device upon powering on. Please confirm whether the device you last used the earbuds with is the current device you want to connect to.
2. After the headphones are powered on or exit sleep mode, the reconnection timeout period is 1 minute. If reconnection times out, the headphones will enter pairing mode and remain in this mode for 2 minutes. It is recommended to re-search for the headphones on your device to connect at this time. If no connection is established within 2 minutes, the headphones will enter a disconnected state. Press and hold the Bluetooth pairing button again until the white light flashes, then search for and connect to the headphones on your device.
3. Please check if a USB-C charging cable or 3.5mm cable is plugged in. When a wired audio connection is established, the headphones will prioritise wired audio, and the Bluetooth connection will be disconnected automatically. When the wired cable is unplugged, the headphones will automatically trigger Bluetooth reconnection.
4. Press and hold the Bluetooth pairing button for 10 seconds or longer to restore the headphones to factory settings, then re-pair and use them.
5. If the above steps fail to resolve your issue, please use the Nothing X app to download and install the latest software update, then try again.
*All device customisations are already integrated into the Settings of Nothing OS version 1.1.4 and higher. Please keep the Nothing X app updated in the Google Play Store.