Those with the International version can not do a firmware update as mentioned as no Bluetooth is shipped with it. The alternative is a by creating a wire bridge you can see people achieving this through these links
* https://www.youtube.com/watch?v=gqvqy6Ht5Oo&t=782s (Spain)
* https://www.youtube.com/watch?v=RUqSfbm6BbE&t=82s (Korea)
* https://www.youtube.com/watch?v=ALEyGbHP9Gk (Indonesia)
All the best
Omar