During factory setup, the Switch goes through calibration and the generated data from this process is written to two NAND user partitions (PRODINFO and PRODINFOF).

PRODINFOF is a FAT12 compliant filesystem and it's structure can be found here. It's mainly used to keep calibration logs and other assorted files.

PRODINFO is a raw binary blob containing the main calibration data, which ranges from hardware IDs to system keys.

CAL0

This is the raw data stored under the PRODINFO partition.

Offset	Size	Field	Description
0x0000	0x04	MagicNumber	"CAL0" header magic.
0x0004	0x04	Version
0x0008	0x04	BodySize	Total size of calibration data starting at offset 0x40.
0x000C	0x02	Model
0x000E	0x02	UpdateCount	Increases each time calibration data is installed.
0x0020	0x20	BodyHash	SHA256 hash calculated over calibration data.
0x0040	0x1E	ConfigurationId1	Configuration ID string.
0x0060	0x20	Reserved	Empty.
0x0080	0x04	WlanCountryCodesNum	Number of elements in the WlanCountryCodes array.
0x0084	0x04	WlanCountryCodesLastIndex	Index of the last element in the WlanCountryCodes array.
0x0088	0x180	WlanCountryCodes	Array of WLAN country code strings. Each element is 3 bytes (code + NULL terminator).
0x0210	0x06	WlanMacAddress
0x0220	0x06	BdAddress
0x0230	0x06	AccelerometerOffset
0x0238	0x06	AccelerometerScale
0x0240	0x06	GyroscopeOffset
0x0248	0x06	GyroscopeScale
0x0250	0x18	SerialNumber
0x0270	0x30	EccP256DeviceKey	Device key (ECC-P256 version; empty and unused).
0x02B0	0x180	EccP256DeviceCertificate	Device certificate (ECC-P256 version; empty and unused).
0x0440	0x30	EccB233DeviceKey	Device key (ECC-B233 version; empty and unused).
0x0480	0x180	EccB233DeviceCertificate	Device certificate (ECC-B233 version; active).
0x0610	0x30	EccP256ETicketKey	ETicket key (ECC-P256 version; empty and unused).
0x0650	0x180	EccP256ETicketCertificate	ETicket certificate (ECC-P256 version; empty and unused).
0x07E0	0x30	EccB233ETicketKey	ETicket key (ECC-B233 version; empty and unused).
0x0820	0x180	EccB233ETicketCertificate	ETicket certificate (ECC-B233 version; empty and unused).
0x09B0	0x110	SslKey	SSL key (empty and unused).
0x0AD0	0x04	SslCertificateSize	Total size of the SSL certificate.
0x0AE0	0x800	SslCertificate	SSL certificate. Only SslCertificateSize bytes are used.
0x12E0	0x20	SslCertificateHash	SHA256 over the SSL certificate.
0x1300	0x1000	RandomNumber	Random generated data.
0x2300	0x20	RandomNumberHash	SHA256 over the random data block.
0x2320	0x110	GameCardKey	Gamecard key (empty and unused).
0x2440	0x400	GameCardCertificate	Gamecard certificate.
0x2840	0x20	GameCardCertificateHash	SHA256 over the Gamecard certificate.
0x2860	0x220	Rsa2048ETicketKey	ETicket key (RSA-2048 version; empty and unused).
0x2A90	0x240	Rsa2048ETicketCertificate	ETicket certificate (RSA-2048 version; active).
0x2CE0	0x18	BatteryLot	Battery lot string ID.
0x2D00	0x800	SpeakerCalibrationValue	Speaker calibration values. Only 0x5A bytes are used.
0x3510	0x04	RegionCode
0x3520	0x50	AmiiboKey	Amiibo key (ECQV and ECDSA versions).
0x3580	0x14	AmiiboEcqvCertificate	Amiibo certificate (ECQV version).
0x35A0	0x70	AmiiboEcdsaCertificate	Amiibo certificate (ECDSA version).
0x3620	0x40	AmiiboEcqvBlsKey	Amiibo key (ECQV-BLS version).
0x3670	0x20	AmiiboEcqvBlsCertificate	Amiibo certificate (ECQV-BLS version).
0x36A0	0x90	AmiiboEcqvBlsRootCertificate	Amiibo root certificate (ECQV-BLS version).
0x3740	0x04	ProductModel	1 = Nx, 2 = Copper, 4 = Hoag
0x3750	0x06	HomeMenuSchemeMainColorVariation
0x3760	0x0C	LcdBacklightBrightnessMapping
0x3770	0x50	ExtendedEccB233DeviceKey	Extended device key (ECC-B233 version; active).
0x37D0	0x50	ExtendedEccP256ETicketKey	Extended ETicket key (ECC-P256 version; empty and unused).
0x3830	0x50	ExtendedEccB233ETicketKey	Extended ETicket key (ECC-B233 version; empty and unused).
0x3890	0x240	ExtendedRsa2048ETicketKey	Extended ETicket key (RSA-2048 version; active).
0x3AE0	0x130	ExtendedSslKey	Extended SSL key (active).
0x3C20	0x130	ExtendedGameCardKey	Extended Gamecard key (active).
0x3D60	0x04	LcdVendorId
0x3D70	0x240	[5.0.0+] ExtendedRsa2048DeviceKey	Extended device key (RSA-2048 version; active).
0x3FC0	0x240	[5.0.0+] Rsa2048DeviceCertificate	Device certificate (RSA-2048 version; active).
0x4210	0x01	[5.0.0+] UsbTypeCPowerSourceCircuitVersion
0x4220	0x04	[9.0.0+] HomeMenuSchemeSubColor
0x4230	0x04	[9.0.0+] HomeMenuSchemeBezelColor
0x4240	0x04	[9.0.0+] HomeMenuSchemeMainColor1
0x4250	0x04	[9.0.0+] HomeMenuSchemeMainColor2
0x4260	0x04	[9.0.0+] HomeMenuSchemeMainColor3
0x4270	0x01	[9.0.0+] AnalogStickModuleTypeL
0x4280	0x12	[9.0.0+] AnalogStickModelParameterL
0x42A0	0x09	[9.0.0+] AnalogStickFactoryCalibrationL
0x42B0	0x01	[9.0.0+] AnalogStickModuleTypeR
0x42C0	0x12	[9.0.0+] AnalogStickModelParameterR
0x42E0	0x09	[9.0.0+] AnalogStickFactoryCalibrationR
0x42F0	0x01	[9.0.0+] ConsoleSixAxisSensorModuleType
0x4300	0x06	[9.0.0+] ConsoleSixAxisSensorHorizontalOffset
0x4310	0x01	[6.0.0+] BatteryVersion
0x4330	0x04	[9.0.0+] HomeMenuSchemeModel
0x4340	0x01	[10.0.0+]

Error detection

Each block of raw calibration data (with the exception of blocks with SHA256 hashes) is padded to 16 bytes, being the last 2 bytes a CRC-16 over said block.

XX XX XX XX XX XX XX XX XX XX XX XX XX XX XX XX
00 00 00 00 00 00 00 00 00 00 00 00 00 00 YY YY

XX == data
00 == padding
YY == crc

The CRC-16 is generated as follows:

unsigned int crc_16_table[16] = {
 0x0000, 0xCC01, 0xD801, 0x1400, 0xF001, 0x3C00, 0x2800, 0xE401,
 0xA001, 0x6C00, 0x7800, 0xB401, 0x5000, 0x9C01, 0x8801, 0x4400 };

unsigned short int get_crc_16 (char *p, int n) {
 unsigned short int crc = 0x55AA;
 int r;

 while (n-- > 0) {
   r = crc_16_table[crc & 0xF];
   crc = (crc >> 4) & 0x0FFF;
   crc = crc ^ r ^ crc_16_table[*p & 0xF];

   r = crc_16_table[crc & 0xF];
   crc = (crc >> 4) & 0x0FFF;
   crc = crc ^ r ^ crc_16_table[(*p >> 4) & 0xF];

   p++;
 }

 return(crc);
}

Calibration

CAL0

Error detection