iOS will not run modified code unless it is signed with a valid certificate.
For injection directly on an iOS device using tools like Esign:
: The provisioning profile used for re-signing does not match the entitlements embedded inside the application binary. Inject Dylib Into Ipa
For non-jailbroken devices, re-signing is mandatory. The injected IPA must be signed with a valid certificate, and the device's UDID must be added to the provisioning profile for ad-hoc or development builds. Free developer accounts create certificates valid for 7 days, which then require re-signing.
Injecting a dylib into an IPA can have several implications: iOS will not run modified code unless it
Injecting a dynamic library (dylib) into an IPA (iOS App Store Package) is the primary method for adding custom features or tweaks to an app without needing a jailbroken device
Tap on the imported app, select "Signature" from the available options, then tap "More Settings". The injected IPA must be signed with a
– A similar tool that directly patches the binary to add the load command.
: Check device logs via macOS Console app or Xcode. If you see a Signature Invalid error, ensure you signed the injected dylib before signing the main app binary. Also, ensure your dylib does not link against jailbreak-specific libraries (like /usr/lib/libsubstrate.dylib ) if deployed on a jailed device. 2. Missing Dependencies ( Library not loaded )
theotool -c -o /path/to/output/app.ipa /path/to/output/folder