Tethered boot

Everything worked fine until I try to do a tethered boot and season pass ask to put in usb then power and hold play and menu, seasonpass wont work why?

try

1 usb cable

2) menu + play/pause wait for it to say it is in dfu mode

3) power 

to enter DFU try this

menu and - button 6 seconds ( until rapid flashing )

then

menu and paly pause button 7 seconds ( until rapid flashing )