How were you able to downgrade it. I've been looking online for a way to downgrade.
Search for the 'charles proxy' method .. it worked for me, back to 1.2.11 but so far tests are inconclusive - still a bit crackly for me when using multipoint. Would really really like a proper fix from bose - looking at the length of this topic doesn't give me too much confidence though
After the downgrade I needed to re-pair my devices. Since then: smooth like chocolate, also with multiple devices connected.
Again: Shame on Bose... Fix your stuff!