Can't extract NCA file from .nca folder

[Real96]

I'm trying to extract a nca update file from a .nca folder with a single 00 file inside (it is Pokémon Sword update). I downloaded last hactool.exe release and used this command:

hactool -k foldername/prod.keys -t nax0 --sdseed=XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX --sdpath="/foldername/folder.nca" --plaintext=game.nca "D:/foldername/folder.nca/00"

prod.keys file is inside the correct folder, i extracted it using Lockpick_RCM. Changed the Xs with sd_seed found inside prod.keys file. I'm getting this (i removed the values between the ""):

[WARN] prod.keys does not exist.
[WARN]: Failed to match key "bis_kek_source", (value "")
[WARN]: Failed to match key "bis_key_00", (value "")
[WARN]: Failed to match key "bis_key_01", (value "")
[WARN]: Failed to match key "bis_key_02", (value "")
[WARN]: Failed to match key "bis_key_03", (value "")
[WARN]: Failed to match key "bis_key_source_00", (value "")
[WARN]: Failed to match key "bis_key_source_01", (value "")
[WARN]: Failed to match key "bis_key_source_02", (value "")
[WARN]: Failed to match key "device_key", (value "")
[WARN]: Failed to match key "device_key_4x", (value "")
[WARN]: Failed to match key "eticket_rsa_kek", (value "")
[WARN]: Failed to match key "eticket_rsa_kek_source", (value "")
[WARN]: Failed to match key "eticket_rsa_kekek_source", (value "")
[WARN]: Failed to match key "retail_specific_aes_key_source", (value "")
[WARN]: Failed to match key "rsa_oaep_kek_generation_source", (value "")
[WARN]: Failed to match key "rsa_private_kek_generation_source", (value "")
[WARN]: Failed to match key "save_mac_key", (value "")
[WARN]: Failed to match key "save_mac_sd_card_kek_source", (value "")
[WARN]: Failed to match key "save_mac_sd_card_key_source", (value "")
[WARN]: Failed to match key "sd_card_custom_storage_key_source", (value "")
[WARN]: Failed to match key "sd_seed", (value "")
[WARN]: Failed to match key "ssl_rsa_kek", (value "")
[WARN]: Failed to match key "ssl_rsa_kek_source_x", (value "")
[WARN]: Failed to match key "ssl_rsa_kek_source_y", (value "")
Error: File has invalid NAX0 magic!
Done!

What is the problem?

[shchmue]

That’s not a nax0 that’s an nca.

[shchmue]

oh, nuts, it should be a nax0 after all if it's content on SD. i guess try -t nca? the nax0 magic is not encrypted.

[Real96]

Ok i used the same command i wrote before with -t nca. It worked but gave me this at the end:

`BKTR section seems to be corrupted.

Error: section 0 is corrupted!

Note: cannot save BKTR section without base romfs.

Saving Decrypted NCA to game.nca...
Done!`

Is this ok? Or do i need the romfs?

[shchmue]

up to you, you do indeed need to provide the base title to extract romfs

[Real96]

I gave it the romfs but still gives me always the same ending corruption error...i added --romfs=romfs.bin near -t nca (i extracted the romfs.bin from the dumped xci)

[Real96]

Anyway it isn't an SD content, the file is inside the USER partition. Both Pokemon Sword and Shield updates are inside the USER partition

[ToasterDEV]

Hey there!

I'm having the same issue.

After building hactool from source on Ubuntu 20.10 on a WSL2 host and providing the following command:

hactool -t nax0 --sdseed="XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX" 
--sdpath="/registered/00000000/6b37623b1b74cc73e13d1a13c0bb87d0.nca"
--plaintext 00000000.nca "/mnt/c/Users/ToasterDEV/OneDrive/Desktop/Nintendo/Contents/registered/00000000/6b37623b1b74cc73e13d1a13c0bb87d0.nca/00"

I receive the following output (prod.keys has been extracted from my Switch and stored within Ubuntu in "~/.switch/prod.keys"):

[WARN]: Failed to match key "bis_kek_source", (value "")
[WARN]: Failed to match key "bis_key_00", (value "")
[WARN]: Failed to match key "bis_key_01", (value "")
[WARN]: Failed to match key "bis_key_02", (value "")
[WARN]: Failed to match key "bis_key_03", (value "")
[WARN]: Failed to match key "bis_key_source_00", (value "")
[WARN]: Failed to match key "bis_key_source_01", (value "")
[WARN]: Failed to match key "bis_key_source_02", (value "")
[WARN]: Failed to match key "device_key", (value "")
[WARN]: Failed to match key "device_key_4x", (value "")
[WARN]: Failed to match key "retail_specific_aes_key_source", (value "")
[WARN]: Failed to match key "rsa_oaep_kek_generation_source", (value "")
[WARN]: Failed to match key "rsa_private_kek_generation_source", (value "")
Error: NAX0 key derivation failed. Check SD card seed and relative path?
Done!

(The value of the reys was manually removed by me when copying the output over.

Trying the same command but with "-t nca" ( hactool -t nca --sdseed="XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX " --sdpath="/registered/00000000/6b37623b1b74cc73e13d1a13c0bb87d0.nca" --plaintext 00000000.nca "/mnt/c/Users/ToasterDEV/OneDrive/Desktop/Nintendo/Contents/registered/00000000/6b37623b1b74cc73e13d1a13c0bb87d0.nca/00" ) produces the following output:

[WARN]: Failed to match key "bis_kek_source", (value "")
[WARN]: Failed to match key "bis_key_00", (value "")
[WARN]: Failed to match key "bis_key_01", (value "")
[WARN]: Failed to match key "bis_key_02", (value "")
[WARN]: Failed to match key "bis_key_03", (value "")
[WARN]: Failed to match key "bis_key_source_00", (value "")
[WARN]: Failed to match key "bis_key_source_01", (value "")
[WARN]: Failed to match key "bis_key_source_02", (value "")
[WARN]: Failed to match key "device_key", (value "")
[WARN]: Failed to match key "device_key_4x", (value "")
[WARN]: Failed to match key "retail_specific_aes_key_source", (value "")
[WARN]: Failed to match key "rsa_oaep_kek_generation_source", (value "")
[WARN]: Failed to match key "rsa_private_kek_generation_source", (value "")
Invalid NCA header! Are keys correct?
Done!

I'm trying to extract the NSPs of my downloaded content as per this guide to be able to install again on my switch, after similar issues happened while using SwitchSDTool, but I keep getting stuck at this step.

Is there anything else I should be trying?

[bao3]

OK. I had the same issue,but I fixed it , just put the prod.keys at $HOME/.switch