How to combine a dylib and an IPA file so you can use a modified IPA on jailed iOS

Patch dylib to IPA.md

Prerequisites

• Install Xcode from the Mac App Store
• Install theos. You don't need to install the SDK
• Install theos-jailed. You don't need ios-deploy
• Get a decrypted ipa of the app you want

Prepare the IPA file

1. Change the .ipa file extension to .zip & unzip it
2. Open the Payload folder, right-click on AppName.app, then click “Show package contents”
3. Open Info.plist in Xcode
4. Find the UISupportedDevices row and delete it
5. Determine the minimum iOS version your app requires and change the MinimumOSVersion row to reflect this (see below)
6. Find the “Bundle identifier” key and remember its value (for example: com.spotify.client)
7. Zip the Payload folder
8. Rename Payload.zip back to AppName.ipa

How to find the minimum iOS version:

1. Search for the app in the App Store, tap on it, scroll down to the “Information” section, and tap “Works on this iPhone”
2. It will now say something like “Requires iOS 11.0 or later”. Type “11.0” into MinimumOSVersion

Compile the IPA

1. Open Terminal.app on your Mac and type "$THEOS/bin/nic.pl"
2. Choose "iphone/jailed"
3. For “Project Name”, type the name of your app (for example: Spotify)
4. For “Package Name”, type the Bundle Identifier from Info.plist (for example: com.spotify.client)
5. For “Path to .ipa”, type AppName.ipa
6. Type “open ./AppName”
7. Copy the “fixed” AppName.ipa into this folder
8. Copy all of your dylibs into this folder
9. If you have a .bundle, icon files, or other stuff, make a folder called “Resources” and put them inside
10. Open Makefile in TextEdit
11. At the very top, add this line: "AppName_INJECT_DYLIBS = TweakName.dylib". If you have multiple dylibs, simply list them all out with a space between entries (for example: "Spotify_INJECT_DYLIBS = Spos.dylib TrueShuffle.dylib")
12. Change the AppName_IPA line to simply “AppName_IPA = AppName.ipa”
13. Delete the “AppName_FILES” line
14. Go back to Terminal and type “cd ./AppName”
15. Type "make clean all package FINALPACKAGE=1 CODESIGN_IPA=0"
16. Done! Your final ipa is in the “packages” folder

You can install it with Impactor, AltStore, ReProvision, or Xcode + iOS App Signer

Note: People trying this with YouTube: sideloading with Xcode + iOS App Signer will change the bundle identifier of the ipa. Google checks the bundle identifier, and if it’s been tampered with, they won’t let you sign in to your Google account. To fix this, sideload with Impactor, AltStore, or ReProvision instead

People trying this with Cercube: you need to put /Library/Application Support/Cercube/Carida.bundle into the Resources folder. If you don’t, the ipa will crash every time you open it

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Credits to /u/CaptInc37