New use for old Toshiba RS-TX20

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New use for old Toshiba RS-TX20

I have an old Toshiba RS-TX20 that I would like to repurpose. I am looking for help or guidance on putting a new image on this device.  Basically I want a DVR that does not have Tivo on it at all.  I was thinking maybe MythTV or SageTV?  Does anyone know if its possible to reimage this device and run a DVR program on it other than Tivo?