ANR8365E UPDATE DEVCLASS: The DEVTYPE parameter cannot be changed.
ANS8001I Return code 3.

Does anyone have any suggestions on how to update the devclass.

The error message pretty much says it.

If you want data to go to a different type of tape, define a new devclass
and stgpool(s) that will use that devclass.  Once that is set up, update
your copygroup destinations to point to the new stgpool(s).

-Ted