ROM Hack Question Extract NCA files from Update

[Pedro250]

Hi, i am trying to extract Pokemon Lets Go Pikachu RomFS files to edit them with pkNX but i am having a problem.

This is my folder:

As you can see i have hactool, my keys file (got it with LockPickRCM from my V9.0.1 switch), the NCA-NSP-XCI_TO_LayeredFS v 1.6.4 that i got here on GBATemp and two folders:

- Base with all folder that i extract from the stock game nsp

- Update with all folder that i extracted from the 1.0.2 update

The base.nca and update.nca are just copies of the bigger files in each folder.

So far so good but when i try to extract the update to get the romfs files (the base game i can extract without problem and get all the exefs and romfs files) i get this error:

I already tried a bunch of different applications that i got here on GBATemp but i all ways get this error. I can get the exefs files for the update but not the romfs files.

I am doing anything wrong?

 

[masagrator]

Yes, you need to put decrypted NCA from base for update. Update doesn't contain romfs files, but diffs.
So you need to decrypt Base NCA with --plaintext and use it in --basenca

 

[Pedro250]

Yes, you need to put decrypted NCA from base for update. Update doesn't contain romfs files, but diffs.
So you need to decrypt Base NCA with --plaintext and use it in --basenca

Hi, thanks.

I did as you said and decrypted the base game nca.
I also tested the decrypted file to be sure it is decrypted by trying to extract it without a key and it worked so the base.nca is not the issue.

Then i used this command:

hactool.exe -k keys.ini --titlekey=77xxxxxxxxxxxxxxxxxxxxxxxxxxxx83 --basenca="base.nca" --section1="romfs.bin" --exefsdir="exefs" "update.nca"

The titlekey is the key from the update, not the base game, cloud that be the problem? I got it from the .tik file in the update.nsp extracted files.


This is what i get:

Again i get the exefs for the update but not the romfs files.

I know i am doing somethign wrong, just not where.

 

[masagrator]

Why you are extracting it to bin? Just use --romfsdir
Put titlekey after basenca command
And you are using latest build of hactool or latest release? Last release is outdated.

--------------------- MERGED ---------------------------

Here you have compiled build that is compatible with latest games
https://github.com/SciresM/hactool/files/3317509/hactool.zip

 

[Pedro250]

EDIT
Its working now, turns out that, because i decrypt it with the old hactool, it didn't do it properly. I decrypt it with the hactool that you provided and it worked. Thanks for the help.
_________________________________________________________________________________________________________________________________________

Why you are extracting it to bin? Just use --romfsdir
Put titlekey after basenca command
And you are using latest build of hactool or latest release? Last release is outdated.

--------------------- MERGED ---------------------------

Here you have compiled build that is compatible with latest games
https://github.com/SciresM/hactool/files/3317509/hactool.zip

I used the hacktool that you provided and made the changes you suggested.
This is the line now:

hactool.exe -k keys.ini --basenca="base.nca" --titlekey=77xxxxxxxxxxxxxxxxxxxxxxxxxxxx83 --romfsdir="romfs" --exefsdir="exefs" "update.nca"

It was working fine util about half of the extractio when this happened:

Also i noted that in the extracted update nsp folder there are two nca files about the same size. I am using the largest one (one with 33 643 KB) but there is also one with 23 632 KB. Could that also be needed for this?

Do i need to decrypt the update nca also?

 

[0N666]

i'M TRYING TO EXTRACT THE FILE FROM THE LATEST nso n64 UPDATE, SO i CAN FIND THE TITLE IDS FOR THE ADDED GAMES...

Can anyone help me with this?

No matter what program i use i can not extract anything from the nca file...

 

[sax_hakulamatata]

i'M TRYING TO EXTRACT THE FILE FROM THE LATEST nso n64 UPDATE, SO i CAN FIND THE TITLE IDS FOR THE ADDED GAMES...

Can anyone help me with this?

No matter what program i use i can not extract anything from the nca file...

use nsc_builder
input 6 into ADVANCED mode
choose nsp/xci file
input 1
input 4: extract nca contents from nsp\xci