Hi tonyscotthao,
Currently, unlocking the THRII series amps work via cable connection, which should be explained in the instructions coming with the amp.
Otherwise, please have a look at the instructions stated above.
For the initial support of the device, Yamaha made the decision to not support Bluetooth to unlock the Cubasis LE feature set.
However, it is planned to release a Cubasis LE 2.8.3 update at the end of March 20, which will support the LE feature set unlock of the THRII series amps via Bluetooth. The same date, Cubasis LE 3 is planned to be released, which same way will support the amp series.
Normally, it is only required to connect the supported device once, to unlock the Cubasis LE feature set, except for the case of reinstalling the app.
In addition, here is the link to the Cubasis LE Compatible Hardware list, to learn more which devices can be used to unlock Cubasis LE from demo mode.
Please get in touch with Yamaha regarding the remaining THRII related questions.
Hope that helps.
Best,
Lars