If you still want to proceed with installing a fixed Facebook Lite IPA for testing or legacy device purposes, using a personal computer to sign the app yourself is the most stable and secure method. This fixes the common "Unable to Verify App" errors associated with free web-based installers. Prerequisites A computer running Windows or macOS. The latest version of iTunes installed (if using Windows). A USB cable to connect your iPhone to your computer. A free or developer Apple ID. Step 1: Download a Verified IPA File