If the Bluetooth version is lower than the version supported by your phone, you can try the following workaround:
1. Update your phone's firmware: Check if your phone has a firmware update available to support a higher version of Bluetooth.
2. Try an adapter: Buy a Bluetooth adapter and connect it to your phone to support lower versions of Bluetooth devices.
3. Contact the manufacturer: Consult the manufacturer of your Bluetooth device to see if there are firmware updates or other solutions available.
4. Consider replacing your device: If none of the above methods work, you may want to consider replacing your Bluetooth device to ensure compatibility with your phone.
Bluetooth not only needs software support, but also needs hardware support.
< br >
Most Bluetooth headphones have a single function, and products made with the ROM version of the chip manufacturer's chip generally have been burned into the ROM at the factory, and can not be repeatedly erased, so it can not be upgraded.
< br >
If you want to change the Bluetooth version, you must remove the machine and replace the chip of the Bluetooth module with another version. It is recommended to find professional mobile phone maintenance personnel to help replace.
Bluetooth devices lower than the Bluetooth version of the mobile phone can be used, Bluetooth protocol is backward compatible and there is no problem of unable to connect to use. However, it is possible that the lower version of Bluetooth does not provide the full Bluetooth functionality. For example, Bluetooth 2 or 3 headphones can't connect to the phone to listen to music but can still make and receive calls.