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Question: JVC HM-DH30000U Digital VHS Recorder questions

My JVC HM-DH30000u digital vhs recorder says "Limited" on the front. Do you know how it differs from the standard model? Does it need the firmware upgrade? Also, I don't have a D-vhs specific cleaning tape. Will using a regular vhs cleaning tape hurt the machine? Thanks much for any help/advice you can offer. Ken G.