How to extract RomFS

[Upset-Swimming5103]

I wanted to extract the RomFS for Pokemon Violet in order to mod the game (of the base game + update since that's what I have at the moment). However, NXDumpTool throws the error:
`decryptNcaHeader: invalid NCA magic word! Wrong header key? (0x5FA22CA9)
Try running Lockpic_RCM to generate the keys file from scratch`
for firmware 19.0.1 (sysmmc) (I believe that's a more general issue with nxdumptool as shown by their issues tab). What tools do I use to extract RomFS then?

 

[draftguy123]

I wanted to extract the RomFS for Pokemon Violet in order to mod the game (of the base game + update since that's what I have at the moment). However, NXDumpTool throws the error:
`decryptNcaHeader: invalid NCA magic word! Wrong header key? (0x5FA22CA9)
Try running Lockpic_RCM to generate the keys file from scratch`
for firmware 19.0.1 (sysmmc) (I believe that's a more general issue with nxdumptool as shown by their issues tab). What tools do I use to extract RomFS then?

Nstool on a computer.

Backup the game, create a .switch folder in the userfolder and copy the LockpickRCM keys inside.
Create a new folder and put the nsp and nstool in there.

Then from the cmd:

nstool -x out gamename.nsp

nstool out/number-of-the-tik.tik

mark the encrypted titlekey and press strg-c
Data:
encrypted titlekey

nstool --titlekey encrypted titlekey -x romfs out/big-nca.nca

 

[draftguy123]

@Upset-Swimming5103

EDIT
A better way is (/ would be) using DBI (658-en)
(USB-C cable required)

Browse installed applications and select the game - press (A),
then select base game *or the latest update* (up / down) and press (+) to
Expose contents via MTP
Finally copy romfs / *the file(s) needed*

Repeat with the latest update and copy / overwrite into the base game romfs folder

 

[Naruiimoura]

@Upset-Swimming5103

EDIT
A better way is (/ would be) using DBI (658-en)
(USB-C cable required)

Browse installed applications and select the game - press (A),
then select base game *or the latest update* (up / down) and press (+) to
Expose contents via MTP
Finally copy romfs / *the file(s) needed*

Repeat with the latest update and copy / overwrite into the base game romfs folder

i dont have this option, i missing something?

Post automatically merged: Jan 28, 2025

@Upset-Swimming5103

EDIT
A better way is (/ would be) using DBI (658-en)
(USB-C cable required)

Browse installed applications and select the game - press (A),
then select base game *or the latest update* (up / down) and press (+) to
Expose contents via MTP
Finally copy romfs / *the file(s) needed*

Repeat with the latest update and copy / overwrite into the base game romfs folder

i dont have this option, i missing something?

 

[cybrnook]

i dont have this option, i missing something?

Post automatically merged: Jan 28, 2025

i dont have this option, i missing something?

Make sure you've run the rcm lockpick payload from Hekate and your prod.keys file exists in your /switch folder. That file needs to be there for decoding functionality to work in DBI (it won't show up if it's not there).

 

[draftguy123]

i dont have this option, i missing something?

Post automatically merged: Jan 28, 2025

i dont have this option, i missing something?

https://gbatemp.net/download/lockpick_rcm-1-9-13-fw-19-zoria.38848/