Why can't I pair Ear (a) to my iPhone after the reset?

Please follow the below steps to resolve the issue on your iOS device:
1. Open "Settings" on iPhone.
2. Tap on "Bluetooth."
3. Find the earbuds you want to forget in the list of devices.
4. Tap the "i" icon next to the earbuds.
5. Tap "Forget this device."
6. Confirm the action by tapping "Forget device" in the pop-up.
7. Open the Nothing X App to pair the earbuds again.