Hello, If you already signed a NDA with Qorvo, the best is to go to your Sales Rep or FAE. You should get your answers through this way.
We don’t offer SDK for android, the one you points on github come from people we don’t know. The hex file likely comes from an old SDK we provided (the 0.1.1 version) and it is no more available on our website I think.
Concerning the channel, maybe you did updated the default configuration, but when setting up a Fira session, it is possible to choose the channel, so maybe the channel is set this way, bypassing your default value.