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TinyFormat is a small utility to format Sys/EmuNAND using FS:InitializeCtrFileSystem but without formating your SD card.
More info about FS:InitializeCtrFileSystem http://www.3dbrew.org/wiki/System_Settings (System Format) http://www.3dbrew.org/wiki/FS:InitializeCtrFileSystem
Download: https://github.com/javimadgit/TinyFormat/releases
Requires devkitARM and libctru