I never got the whole "sell your 3DS and buy a new one" thing. So what you're saying is just sell all my years of save data to get a brand new 3DS? I have a regular 3DSxl and a new3DSxl. I'd prefer the CFW on my new, but if I have to get it on my old I will.
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Just looked at my old3dsxl. Firmware is 9.5. I would assume there's cfw for that.