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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 |