Hi!
Sorry to be the bearer of bad news, but according to the Owners Manual for this unit:
http://www.busse-yachtshop.de/pdf/simrad-rd68.pdf (Page 6),
to erase a previously entered MMSI, the radio must be sent to a Simrad authorized dealer. I suppose this feature was put into effect to cut down on stolen Simrad products.
Hope this is helpful, sorry I couldn't do more for you.
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