Some questions about firmware_keys.zip

[ddawx123]

Hello, I would like to ask how to obtain the firmware_keys in your repository? I checked the ipsw.me official website and found that the ipsw corresponding to the tvOS version code 17M61 (tvOS 13.4.8) and the zip corresponding to the ota version code 17M61 (audioOS 13.4.8) of audioOS are still in the signed state. If there is a corresponding key file, can I downgrade from audioOS18.5 to this version? If there is a way to obtain the key file, could you communicate with me? Thank you very much.

[ddawx123]

Here are two additional links to the signed status files:

tvOS full ipsw: https://ipsw.me/download/AppleTV5,3/17M61
audioOS ota: https://ipsw.me/download/ota/AudioAccessory1,1/17M61?prerequisite=

[UnbendableStraw]

Nice find! For some reason I have never noticed the corresponding audioOS was still signed.

"Keys" for newer OSes / decrypted im4m are made up as you saw.

Keys for older OSes like 13, I have not been able to make my own keys yet. Here are some notes from tihmstar when I tried;

https://github.com/tihmstar/fwkeydb_tools

install the dependencies (iirc just pzb, img4tool)
create a list of urls you want to decrypt
clone the fwkeydb_tools repo and fork the fwkeydb repo
use the tools from the fwkeydb_tools to generate the keys, but commit them to the fwkeydb repo and create a pullrequest

generating keys can be done as easy as:
cat list_with_links.txt | python decryptFirmwareBatch.py

Before running that command you'll need to setup a decryptor. If you want to use gaster, move the moduleDecryptorGaster.py file from the exampleModulesDecryption folder to the modulesDecryptionfolder

[ddawx123]

Thank you very much! Let me try🤣