So I've been affected by speaker crackling/distortion in certain tones/apps/music on my new 6s and have been doing my research online before booking a Genius Bar appointment or calling Apple. Some have claimed an update to the latest version of 9.2 Beta has fixed this for them. I've never downloaded a beta version of iOS before and it clearly states on the Apple site that it shouldn't be installed on a primary device, which my 6s certainly is. Can I go ahead and be confident I won't destroy my phone by trying this option out before taking the next step?