Ask your other investors and BoD. If they are onboard refunding one investor, go ahead. It is a convertible note so there most probably a conversion and paybac

Ask your other investors and BoD. If they are onboard refunding one investor, go ahead. It is a convertible note so there most probably a conversion and payback timeline in the note. If BoD/other investors decline to agree to refund now, let the investor know his options from the convertible note agreement. Good Communication is the key to managing that investor going forward.