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Without the solution being technical, all you can do is press the volume up key to the max while on the call or whatever is using the speaker.
I can say, I did the registry hack while trying to default BT headset volume. BT headset volume can't be defaulted to max, but I did get the speaker volume so loud, I totally undid the registry hack. It was just too loud and I discovered I preferred the volume settings where they are without the hack for normal use.
But if you need the volume louder, the registry hacks work. (Really well.) I understand you don't want to mess anything up, but if you give it a shot, just run a backup of your device first .
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