MMNODYNDWNGRD, Unable to use dynamic downgrade with MM access method for region xxx. Use BG access method for downgrade
MUPIP/Runtime Error: An attempt was made to use MM mode on a database that has not completed being downgraded. MM mode is only supported on fully downgraded or fully upgraded databases.
Action: Use MUPIP SET FILE or MUPIP SET REGION with the ACCESS_METHOD parameter to set the access mode to BG. Then complete the file downgrade using MUPIP REORG DOWNGRADE or file upgrade using MUPIP REORG UPGRADE. And finally set the access mode back to MM using the MUPIP SET FILE or MUPIP SET REGION command again.