Hello, I booked an ATH-LCA-ATH as a return ticket, with the outbound in Comfortflex, return in Flex. I need to have the option to move to an earlier flight the same day on the outbound.

Do I lose the benefit of a free change to an earlier flight the same day if I upgrade the outbount reservation with a coupon? ( I wouldn't mind if the coupon is wasted and I get to sit in Economy again, or if I had to use a second coupon to upgrade again if possible on such short notice.)

Do I lose that benefit of a free change to an earlier flight on the outbund if I upgrade only the *return* with a coupon?