@Kevin_Z thanks for the suggestion. I did not try it because the Deco App had offered newer firmware version (1.0.5) which I could install without having to disconnect the slave M4s.

Hi I have an M3W unit connected to my mesh (3pcs M4 unit). Application shows a firmware update for the M3W but it fails to update. The firmware currently being used us 1.0.3 Build 20190419 Rel....