Just make sure you have your old (current) firmware version downloaded and saved somewhere before you try the beta.
When I got my Sena SMH10-11 about 4-5 months ago, after I got it setup and running I checked and they had a beta firmware version available at that time. When I downloaded and installed it (with no apparent problems) I could no longer connect with my multimedia device (SM10) and zumo 550 GPS simultaneously. Either one alone was fine, but not both together. Rolled back to the non-beta firmware and all was well again.
It seems to me that if you load this new firmware you have the option to listen to the same media stream, or listen to your own. Not a very big deal for me because the SM10 performed that dual streaming function anyway. Plus I only have one SMH10 headset, so I only use the BT setup when I'm solo.