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Easiest is to leave the device in guide mode and use it as progress capturing while hauling. You can try to attach yourself with a prusik on the brake strand and weight it with your body, while pulling on the climber's side of the rope. For passing a crux this should be enough.

Often a munter hitch behind the reverso/atc is used to lower a climber.

To add to this, simply said: if you pull on the device with a biner it will suddenly release and your climber will plummet. You need a backup before doing this.