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nand:/sys/HWINFO_S.dat is a file used by stage2 to boot. It contains an RSA signature for verifying that this file was issued by Nintendo. The RSA header is similar to nand:/shared1/TWLCFG0.dat and nand:/sys/HWINFO_N.dat.

Body format

Start Length Description
0x00 0x9 Unknown
0x09 0xe Serial number
0x17 0x1 Unknown
0x18 0x4 System Menu title ID