I've recently acquired the old regular 3DS with a 4.5 sysnand that I could use for cfw and hacks/homebrew of sorts. As far as I understand it, all the relevant functions are available on firmware up to 9.2, so is it a good reason to use a cartridge to "promote" the original firmware up? I suppose I could just keep 4.5 sysnand if there's no incentive to change anything, but I'm not so well informed about this. Finally, I've been wondering about backing sysnand before I proceed with any further operations - would a backup of 4.5 be preferred to a 9.2 one - again, is there any practical difference? Many thanks in advance.