Erase the device. When setting up, do not restore from a backup. Sign in with the Apple ID that originally bought GarageBand between 2013 and 2015.
Always download GarageBand from the . Do not attempt to install unsigned .IPA files from third‑party websites or use “sideloading” tools that claim to offer older versions. Those files may contain malware, cannot be verified by Apple, and violate Apple’s terms of service. The “last compatible version” method described above is the only safe and supported way to get an older GarageBand working on iOS 15.7. garageband ios 157 download work
Therefore, on iOS 15.7, the App Store will serve (or possibly 2.3.11 if your device is truly on the edge of compatibility). This is a stable, feature‑rich version that includes: Erase the device