220 film with Rolleicord IV

It's possible to use 220 film with a Rolleicord IV, you only need to open the camera back after to shoot the frame 12 (in complete darkness before to advance the film!) to reset to "0" the film counter and closing the camera back again, you could lose 1/2 to 1 frame only. You can see below my first 220 Kodak Tri-X 220 film drying (only B&W film available for 220), you also can see some blank frames, they have nothing to do with the film or camera film transport, it happened because I was taking nocturnal photographs and the cable release did not lock the shutter at the open "B" position. (click on thumbnail)