so if it wasnt clear enough in the video. what you have to do is unplug your ethernet cable. wait approx 1 second (if the message pops up saying "you have been disconnected from techland servers" then you'll have to retry) the timing here has to be perfect so that as soon as the disconnect message in dying light appears you press X etc... the message should disappear but the sell all tab should still be open. proceed over to the buy back tab and then press "sell all" this will then buy a load of the item you wanted. hopefully this is made clearer with the video.
Original variation of the glitch: • Dying Light Lager Verdopplungs Glitch (999...