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	<code>hwcal0</code> and <code>hwcal1</code> were not included in <code>essential.exefs</code> before GodMode9 v1.3.0 ({{Start date and age\|2017\|08\|07}}).		<code>hwcal0</code> and <code>hwcal1</code> were not included in <code>essential.exefs</code> before GodMode9 v1.3.0 ({{Start date and age\|2017\|08\|07}}).
	[[Category:Nintendo 3DS information]]		[[Category:Nintendo 3DS information{{#translation:}}]]

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<languages/>
This is a list of important system files or other data.
{| class="wikitable"
!Filename
!Name in essential.exefs
!Path in GodMode9
!Purpose
!Importance
|-
|<code>LocalFriendCodeSeed_B</code>
|<code>frndseed</code>
|<code>1:/rw/sys/LocalFriendCodeSeed_B</code>
|Used to identify the console for online play.
|Bans from online play are effectively bans on the LFCS. (Don't ask here or NH for help on how to get unbanned.)
|-
|<code>HWCAL0.dat</code> and <code>HWCAL1.dat</code>
|<code>hwcal0</code> and <code>hwcal1</code>
|<code>1:/ro/sys/HWCAL0.dat</code> and <code>1:/ro/sys/HWCAL1.dat</code>
|Contains hardware calibration data. Parts of this are put into the Config savegame during first-time setup.
|If this file is lost or taken from a different console, then when the console is formatted, the calibration data will be inaccurate and can result in problems such as flickering screens.
|-
|<code>movable.sed</code>
|<code>movable</code>
|<code>1:/private/movable.sed</code>
|Contains data that is used to encrypt digital games and saves on the SD card. Also used for CMACs on various NAND files.
|Keeping a backup of this is important if you want to ensure you can still recover your old saves if your console is lost or broken!
|-
|NAND CID
|<code>nand_cid</code>
|<code>M:/nand_cid.mem</code>
|Used as part of the NAND encryption.
|This can be used to decrypt a NAND backup on a PC, however it's not strictly required for 99.9% of cases.
|-
|NAND header
|<code>nand_hdr</code>
|<code>S:/nand_hdr.bin</code>
|Contains information on the NAND partitions. The console-unique part here include the TWL MBR, which is encrypted per-console.
|Corrupting this will prevent the console from starting. However GodMode9 can generate a new one in its place if you can use it through something like [[3DS:Ntrboot|ntrboot]].
|-
|OTP
|<code>otp</code>
|<code>M:/otp.mem</code> and <code>M:/otp_dec.mem</code>
|Contains various kinds of console-unique data. Used to generate encryption keys and identifies a console in some cases like the eShop. See also: [[3dbrew:OTP Registers]]
|This is required to decrypt a NAND backup on a PC. Sharing this means someone could impersonate your console to Nintendo, so don't post it in a public space!
|-
|<code>SecureInfo_A</code> or <code>SecureInfo_B</code>
|<code>secinfo</code>
|<code>1:/rw/sys/SecureInfo_A</code> or <code>1:/rw/sys/SecureInfo_B</code>
|Used to identify the console in some cases like the eShop.
|Sharing this means someone could impersonate your console to Nintendo, so don't post it in a public space!
|}
== Notes ==

GodMode9 does not automatically update the essential backup; to manually update it, choose a NAND image (either SysNAND, EmuNAND, or a backup on the SD card), then choose "NAND image options..." -> "Update embedded backup".

<code>hwcal0</code> and <code>hwcal1</code> were not included in <code>essential.exefs</code> before GodMode9 v1.3.0 ({{Start date and age|2017|08|07}}).
[[Category:Nintendo 3DS information]]

3DS:System files/en - Revision history

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