Yep that’s no longer available.
Just flash the latest stock firmware in the support thread for the Prime 2…
If you want to use the FAW wireless update zip file - you can after flashing the stock firmware. @Tourbillon
Latest stock firmware is here
Flash back to stock and the visit the Download Category and grab the FAW RC1 firmware that you can update to from the watch storage, no flash tool needed.
But you need to be on stock firmware first.