Hi Jon, I take it you are just fitting the Eprom. I replaced mine and it was straight forward provided your used to this kind of thing.
Safty first, unplug from mains.
Then you have to open it up. I think there was a thread on this.
The chip is easy to see, take a photo first for reference if unsure.
It is just a simple carefull remove and replace. Take static precautions, earth straps. Note which way round the chip goes.
Re-assemble and thats it. You will need to reset your configurations and enjoy.
The latest is 6.2a which should give you Meridian DVD in comms and a DVD label.
Good Luck, Chris
As with all things electronic, if you don't know what you are doing, get qualified help.