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Calling the NAND image size N, EmuNAND places bytes [512:N-1] of the NAND image at byte offset 512 on the SD card, and bytes [0:511] at byte offset N. The modified firmware needs to make sure that NAND reads/writes to the first 512 bytes are redirected properly, but leaves all other accesses unmodified.
Calling the NAND image size N, EmuNAND places bytes [512:N-1] of the NAND image at byte offset 512 on the SD card, and bytes [0:511] at byte offset N. The modified firmware needs to make sure that NAND reads/writes to the first 512 bytes are redirected properly, but leaves all other accesses unmodified.
=== Restrictions on New 3DS ===
If the sysNAND of a New 3DS console is below system version 9.6, it is impossible to have NAND redirection work with a redirected NAND of any system version since 9.6. This is because the [[AES|AES engine keyslots]] introduced for NCCH decryption with 9.6 are initialized by arm9loader using data generated from [[OTP Registers|OTP data] upon boot. Since OTP access is blocked via [[CONFIG_Registers#CFG_SYSPROT9|CFG_SYSPROT9]] shortly after that, it's impossible to perform this keyslot initialization at any later time.