The alert volume is a function of the head unit hardware ... so I doubt it can be increased with a firmware update.
The Edge 1030 Plus has a much more robust speaker and so the alert sounds are louder.
I agree - we need a louder beep like the beep you get when you turn the unit on! My friend has a 1030 and I can hear his beep when he’s behind me but I rarely hear mine.
please see if you can bump up the beep!
Given that this unit has been retired from support, I doubt that this will ever happen.