try this m8 i just got it from post on another forum ..Go to channel 53 (games) and then press standby on the remote.
When the box has powered down, press standby on the remote again to bring back channel 53
As soon as you see the "Loading" text (which is centre screen in white on a black background), press standby again.
Next time you power up the box it should have completely reset itself with all the menus working again.
You may have to repeat this method a few times but it should eventually work, as it is very similar to the old Ondigital teletext fix.