I read your link and did exactly what it said. . . . this is the tutorial I used initially but it failed to get and recognize my Sony bluetooth headphones.
This is the post that fixed my problem with bluetooth. . . (2 years old) I believe.
It was from Joekamprad ‘Der Doktor’.
[ Downgraded bluez packages to 5.64-2 causing failed BT to startup.
[fixed] Important notifications Mar '22 - …written in PHP. sudo downgrade bluez bluez-utils and restarting the service sudo systemctl restart bluetooth.service should be a workaround currently, if you are getting this issue. ](Update to bluez packages 5.64-2 causing failed BT startup [fixed])
5.72 did not work but going to 5.64-2 did as I downgraded to it and then my headphones began working and was recognized by bluez apt in ‘Hardware’. . . bluetooth.
Rich;)
Bluez in Octopi is in the ‘red’
Rich;)