As far as I know, it can't be done because the Hard Drive is married to the receiver. I have heard rumors of people figuring out a way but haven't seen anything absolutely substantiated.
The rumours I've heard have involved a 501 that had NEVER been on the data stream. The guy supposedly swapped in the 80 B drive (thus making it a 508), and when he put it on the datastream, it upgraded. But all that is just a rumour).
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