bluez linux AirPods Pro low volume stuck patch

gistfile1.txt

From: https://unix.stackexchange.com/questions/437468/bluetooth-headset-volume-too-low-only-in-arch/562381#562381

> For those who don't want to compile the whole thing, the hex code of that method (in Ubuntu 20.04) is
> `48 8b 46 70 66 83 78 0a 7f` and if you replace the `7f` with `ff`, that method basically always returns TRUE. 
> Just hexedit your /var/lib/bluetooth/bluetoothd and restart bluetooth.
 
`sudo vi /usr/lib/bluetooth/bluetoothd` (old: `sudo vi /var/lib/bluetooth/bluetoothd`)

-> `:%!xxd`

-> /488b 4670 6683 780a 7f

replace `7f` into `ff`
 
-> `:%!xxd -r` 

-> :wq!

`sudo systemctl daemon-reload`
`sudo systemctl start bluetooth.service`

Volume controls on Airpods Pro should work now

related links: 
- https://unix.stackexchange.com/questions/437468/bluetooth-headset-volume-too-low-only-in-arch/562381#562381
- https://archived.forum.manjaro.org/t/airpods-pro-max-volume-too-low/146508
- https://github.com/bluez/bluez/issues/17