Noob question here!
So I have a O3DS XL that is currently on 11.5.0-38U, w/ CFW installed (following the DSiWare guide from 3ds.guide). On the other hand, I've got a NAND.bin back-up from when I still had rxTools installed (the NAND.bin back-up was created last 2015). Is it safe to use this...