I followed the instructions here:
http://www.digitalspy.co.uk/forums/showthread. php?t=858303
and it worked fine (you do have to be patient as it takes about an hour to update)
Here's the basics:
(It allows you to access a hidden service menu)
You need to press:
MENU - Then press the following number at each stage
4.
6.
1.
3.
9.
7 and then scroll down to select line 17 "Force Next OAD".
The box will then take the OAD in about an hour or so providing your not busy recording several things.