This is a relatively straightforward question. Answers with details highly preferred (rather than yes/no). If no, please explain why? It's now possible to downgrade either O3DS or N3DS to 9.2.0-X, but how far? Let's presume that the SYSNAND has nothing of value (OK to format), there are no save games (OK to re-initialize), and no commercial games are of interest (no upgrade required). Q1. What's the earliest version of firmware that can be downgraded to? The O3DS obviously has much older firmware available than N3DS. If we presume that the user is fine losing all the N3DS features, including the extra memory: Q2. What (if anything) would prevent loading an O3DS firmware onto N3DS (presuming OK to lose N3DS features, including the extra memory)? Really, can v1.x or v2.x firmware (O3DS obviously) load on N3DS? e.g., does the N3DS BOOTROM validating firmware signatures against a different certificate / cert chain than the O3DS BOOTROM? e.g., does the O3DS firmware itself do some sort of hardware check that fails on N3DS? e.g., does the O3DS require a section of the OTP area to contain specific values (after decryption)? Thanks!