ITunes-Synced iPads. To restore a locked iPad with iTunes, use its USB or Lightning cable to connect it to a computer running iTunes. Right click the device's icon when it appears in the iTunes sidebar and click the Back Up option in the menu.If you don't see the sidebar, press Control-S to bring it up.Tunes-Synced iPads. To restore a locked iPad with iTunes, use its USB or Lightning cable to connect it to a computer running iTunes. Right click the device's icon when it appears in the iTunes sidebar and click the Back Up option in the menu.