Thank you.

# fsck /media/<user>/<UUID>

Returns error message:
fsck.ext2: Is a directory while trying to open /media/<user>/<UUID>

The superblock could not be read or does not describe a valid ext2/ext3/ext4

Commands:

# e2fsck -b 8193 <device> 

# e2fsck -b 32768 <device>

Error message:
e2fsck: Is a directory while trying to open /media/<user>/<UUID>

Gparted shows 2 partitions:
1. File system ext4
Flags: msftdata
2. File system 1 mb unallocated
No flags

Are these settings ok for a media drive?

I put the headphone's MAC and name in  ~/.asoundrc , no succes pairing.

Then pipewire
-In sysv-rc-conf unticked all boxes under bluez-alsa and pulseaudio.
-reboot
-In blueman-applet Set up new device, select headphone, Pair device, Failed to add device.
In blueman-applet in the Devices menu the headphone will now also not connect.

Edit: Oops skipped the first step, which is disconnect headphone from other devices. And.. headphone pairs with chimaera.

$ bluealsa-aplay -L
bluealsa:SRV=org.bluealsa,DEV=**:**:**:**:**:**,PROFILE=a2dp
    Yamaha YH-E700A, trusted , playback
    A2DP (SBC): S16_LE 2 channels 48000 Hz
bluealsa:SRV=org.bluealsa,DEV=**:**:**:**:**:**,PROFILE=sco
    Yamaha YH-E700A, trusted , capture
    SCO (CVSD): S16_LE 1 channel 8000 Hz
bluealsa:SRV=org.bluealsa,DEV=**:**:**:**:**:**,PROFILE=sco
    Yamaha YH-E700A, trusted , playback
    SCO (CVSD): S16_LE 1 channel 8000 Hz

Next challenge adding and selecting it in alsamixer.

Edit 2: Ok, working now. The problem was with the headphone and android. Removed saved headphone from android settings, installed Pulseaudio, connecting and audio playback successful. After connecting to the phone I do have to remove/add the headphone from blueman-applet to connect.

Thank you for the feedback.

Thank you dzz

sudo apt-get autoremove pulseaudio

Reboot

sudo dpkg -i libasound2-plugin-bluez_3.1.0~git20211121-1+exegnu1_amd64.deb 
sudo apt install orphan-sysvinit-scripts
sudo dpkg -i bluez-alsa-utils_3.1.0~git20211121-1+exegnu1_amd64.deb 
(Reading database ... 203559 files and directories currently installed.)
Preparing to unpack bluez-alsa-utils_3.1.0~git20211121-1+exegnu1_amd64.deb ...
Unpacking bluez-alsa-utils (3.1.0~git20211121-1+exegnu1) over (3.1.0~git20211121-1+exegnu1) ...
dpkg: dependency problems prevent configuration of bluez-alsa-utils:
 bluez-alsa-utils depends on libldacbt-abr2 (>= 2.0.2); however:
  Package libldacbt-abr2 is not installed.
 bluez-alsa-utils depends on libldacbt-enc2 (>= 2.0.2); however:
  Package libldacbt-enc2 is not installed.

dpkg: error processing package bluez-alsa-utils (--install):
 dependency problems - leaving unconfigured
Processing triggers for dbus (1.12.24-0+deb11u1devuan1) ...
Processing triggers for man-db (2.9.4-2) ...
Errors were encountered while processing:
 bluez-alsa-utils
sudo apt --fix-broken install

reboot

BT headphone briefly connects in blueman-manager and doesn't show in alsamixer.

Thank you for helping a newb out.

Simple mixer control 'Headphone',1

The bt headphone is off and no wired headphone is connected to the 3.5 mm output. Same when bt headphone is on.

In Alsamixer - Card: PulseAudio
if necessary how can i set this to Alsa?

Thanks.
Installed and opened alsamixer, the headphone doesn't show.  Where do i go from here?
No luck with searching with keywords alsa headphone bluetooth.

resolv.conf was empty, putting a nameserver brought back the internet connection.

EDIT: Well, partly solved. After reboot resolv.conf is gone, placing a nameserver in the resolv.conf file in /etc brings back internet.