Four days after a cumulative update for 1809 took me to 17763.593, this morning the “you’re not ready yet” notice was absent and 1903 was offered to me . This is for a first generation Surface Studio. I suppose the CU may have had something to do with it, but maybe not. Are other owners of Studios (or any other Surface device, for that matter) finding that after the latest CU they also can now update from 1809 to 1903?