Hacking BIS Key Mismatch in HacDiskMount, Entropy Failure

Novantico · Jul 9, 2019

Hi everyone,

Some time ago I made a post where I was trying to fix my friend's Switch after being unable to restore an old NAND after blowing fuses, but things didn't quite work out. The original thread elaborates on this, of course.

I had received some helpful comments, and eventually settled on going with the "Upgrading/Downgrading Manually With a PC" guide found here. Things were going surprisingly well until I reached Step 9, where I'm encountering the above-mentioned error. I don't know how it's possible, and from the Googling I've done I didn't really see anything that matched up with my current situation, so I'm hoping someone here could assist me.

Thanks!

Masamune3210 · Jul 9, 2019

Make sure your bis key is correct, it's console unique so you can't use some one else's if you are

Novantico · Jul 9, 2019

Masamune3210 said:
Make sure your bis key is correct, it's console unique so you can't use some one else's if you are

They are mine, which is why this doesn't make sense. Dumped them straight from Hekate per the guide.

F4mouZSt4r · Jul 9, 2019

You cant dump the BISKEYS with hekate
You can only dump them with BISKEYDUMP

Novantico · Jul 10, 2019

F4mouZSt4r said:
You cant dump the BISKEYS with hekate
You can only dump them with BISKEYDUMP

Apologies, I misspoke. Rather, per the guide I mention in the OP, there's a website that uses your fuses.bin and tsec_keys.bin files to derive the BIS Keys. That said, I believe I ended up using biskeydump after because I didn't understand why it wasn't working, and the output was the same as what I had received from the BIS key derivation tool.

Deleted_444986 · Jul 11, 2019

Novantico said:
Apologies, I misspoke. Rather, per the guide I mention in the OP, there's a website that uses your fuses.bin and tsec_keys.bin files to derive the BIS Keys. That said, I believe I ended up using biskeydump after because I didn't understand why it wasn't working, and the output was the same as what I had received from the BIS key derivation tool.

I'm in the same case with a friend keys fail from multiple dump

GalSilver · Aug 22, 2019

Anyone figured it out?

Tafich · Jun 25, 2020

Did anyone solve this?

connectconnect · Jun 25, 2020

I guess this is the web where you can derive biskey from fuses_cached and tsec_keys
https://sdsetup.com/biskeygen

Tafich · Jun 26, 2020

connectconnect said:
I guess this is the web where you can derive biskey from fuses_cached and tsec_keys
https://sdsetup.com/biskeygen

Actually that's the website I used. I can't dump my keys nor boot to CFW or OFW cause I get pkg2 decryption error and CTCaer told me my pkg2 is corrupt after examining the file. So I used that website to get my BIS keys but it shows the entropy error when I try to put the keys at prodinfo

USER, SYSTEM and SAFE keys work fine and display no error.
One thing to keep in mind is that I have my 8.1.0 original prodkey file in my computer. I didn't restore it after using incognito and restoring my clean nand backup. Don't know if that's relevant.

On the other hand I was trying to rebuild my MMC with EmmcHaccGen but since I can't dump my prod.keys correctly it won't work. I do get the prod.keys file while dumping but it seems its corrupted since it also displays the pkg2 error at some point.

This is the error I get at EmmcHaccGen

EmmcHaccGen started
Indexing nca files...
Unable to create NCA class. Is your keyset file valid?
Error: Unable to decrypt NCA header. The file is not an NCA file or the header key is incorrect.

A user around here me told me that I could erase the invalid lines in my prod.keys so I can rebuild the MMC but I don't know which ones since my prod.keys file has 86 key lines.
I can also show you an image of what shows up when I dump my keys via lockchain.

Both ways i'm stuck.

Hacking BIS Key Mismatch in HacDiskMount, Entropy Failure

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