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When connected to bose speaker/headphones the volume on my phone won't turn up all the way. It stops at a certain point. Super annoying. It didn't do this when I first got my phone. I might have done something but not sure how to fix this.
Yes, this only happens when connected to any Bluetooth device. I have tried safe mode and I have factory reset my phone, still having issues.
I am sorry to hear about that @Vasana 
At this point I recommend you contact your Local support team for further assistance.