Well i'm not the one comes for NAND backups. Orz And yes, i hope you can have fun reading this. Yep Know some details or not, I hope you enjoy it, really. Really..? As you may already know, NAND chip have a lifespan - write cycle limit. I think you know it? Of course, 3DS NAND is encrypted, and you have ways to dump it. Yes And surely i think they used some wear leveling or other techs to extend the lifespan for the chip on motherboard. Just as what i planned to do with that f**king chip on a board with STM32 months ago - too hard for me now. When i simply thought someone just played the console too much.. I mean out of its lifespan The chip might get read-only, or even worse. And some new data may also randomly lost. Randomly lost - almost with wear leveling only - if i only writes 1 block then others may still be good for some time. And now the first question jumped out! What is a predictable lifespan of the console? Sounds ridiculous? I mean the maximum time you could play with it. Yes maximum, 8 hours a day or you can still use times to count it. For predictable, i mean like saying one just play Mii Plaza every day and encounter 100. You can make your case. The chip may be 2GB, as other reversed for wear leveling or other. However you can think it is just 1GB. You can guess, predict, or even calculate. For a specific 3ds revision or other you like. Then, what if you redirect most of those IO to SD card. I mean EmuNAND. Horrible lifespan? Also i doubt very much about where the keys should be stored. AES Engine could be in ARM, or somewhere else. OTP stands for One-Time-Programmable. However GW wrote its key into the scramber and so did nintendo (for 7.x). So i thought it might not be in the OTP sections, or other chips we don't know. Maybe only bootrom there..? If that is packed into the core, it still should have an address at least when booting. As you can see on 3DS motherboard picture, and 3dbrew hardware page, there is a customized chip. And that Renesas, productor of the UC CTR/KTR have secure cores with EEPROM. And different OP codes. Don't tell me UC just means User-Customed. I don't know what it may do. CTR on Old 3DS and KTR for new. Thanks for your reading. If you want me know your thoughts please tag me, like @Syphurith. If you think those above are ridiculous, and don't want to reply me, leave it as it is now please, thanks.