Need to reset service spanner on peugeot boxer van 2005 model?

Turn on ignition wait for mileage to appear press and hold the button on speedo display for about 30secs cfg1 should show on display release button press and hold button down again until it flashes or vanishes cant be sure which 1 turn off ignition turn back on service indicator should then be reset repost question if problems

Peugeot master technician
September 2008