The most reliable way to find legacy apps is through community-driven archives. These repositories host thousands of "cracked" or preserved IPAs that were originally built for older hardware.
: An alternative library where you can search for and download IPA files specifically categorized by iOS version and device compatibility. How to Install IPAs on iOS 7.1.2 ipa files for ios 712
Sideloading on original firmware often requires a computer to sign the app with your Apple ID. The most reliable way to find legacy apps
: A massive resource for digital preservation. Look for collections like the iOS 7+ IPA Collection or Legacy iOS Apps . ipa files for ios 712