MRV with instantcake 4.0 & 6.2?

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MRV with instantcake 4.0 & 6.2?

Is it possible to transfer recordings from a Instantcake 4.0 Tivo to a
6.2 Instantcake Tivo? My thinking being,that I could transfer my
recordings,then upgrade the 4.0 image to 6.2,without losing my
recordings. Probably not,but I thought I'd ask.  Thanks!