Guide to Re-signing iOS IPA Files for Custom Apps and WeChat Duplication

This guide explains how to re-sign iOS IPA files using a personal developer account to install modified apps, such as a custom version of an app or a duplicated WeChat client.

First, download the target IPA file (e.g., the original app or WeChat) and verify its usability. Change the extension from .ipa to .zip, extract the archive, and locate the Payload folder containing the .app bundle.

Next, modify the app’s Info.plist to replace the original bundle identifier with your own. Then replace the embedded.mobileprovision file: delete the existing one and copy the new provisioning profile obtained from your own test app.

For apps that contain frameworks (like WeChat), each framework inside the Frameworks directory must be re‑signed with your certificate. Remove the _CodeSignature directory and, if present, the Plugins folder. Generate an Entitlements.plist from the new provisioning profile using the command /usr/libexec/PlistBuddy -x -c "print:Entitlements" /dev/stdin <<< $(security cms -D -i xxx.app/embedded.mobileprovision) > Entitlements.plist , then re‑sign the app and its frameworks with codesign -f -s "Your Certificate" --entitlements Entitlements.plist --no-strict xxx.app (repeat for each framework).

Finally, re‑compress the Payload folder into a ZIP archive and rename it to .ipa. Install the resulting IPA onto a device via Xcode (Window → Devices and Simulators, drag the IPA onto the connected device, or use Shift+CMD+2 to open the device window and add the IPA).