Could someone provide steps for turning on LC3 codec for Air Pro 4 with Pixel 9 phone?

I have a Pixel 8 Pro. Earfun Air 4 Pro and LE Audio / LC3 codec just don't work properly, if at all. The Earfuns also don't work properly with LE Audio and a BT dongle I use at work for MS Teams calls. 

If you want to try...
Tn the Earfun app, go into the connected buds, and switch LE Audio on (switches Google fast pair off)
The buds will reboot.
In bluetooth, find the conected Earfuns, and in the options, set the slider for LE Audio ON. It won't show until the buds are in LE mode in the app.
You can also try unpairing and repairing the buds (remember to slide LE Audio on again in the bluetooth menu)

Sometimes I can get audio to work, but the codec doesn't show in the app, in Android developer options, nor in an app called 'bluetooth codec changer' -- LE just borks everything. Then if I make a call, the mic doesn't work. By comparison, the Soundpeats Air Pro 4 work well with LC3 for music and calls, both with my Pixel 8 Pro and with my BT dongle.

The other day my Pixel 8 Pro got bumped to Android 15 --  LE audio and Earfun still don't work.

 Imho the LE/LC3 capability is not fit for purpose and should be removed from the Earfun app and advertising, until Earfun can make it work properly.