When you connect your iPhone to your computer, AltServer attempts to "mount" this image. This process effectively tells your iPhone, "I am a developer machine, allow me to install and debug apps."
AltServer is the companion application that runs on your computer (Windows or Mac). It acts as the bridge between your PC and your iPhone or iPad. Its primary function is to sign IPA files (iOS App Store Packages) with your personal Apple ID and install them onto your device. This process mimics the method Xcode uses to install test apps, but it automates the complex coding aspects for the average user. Altserver The Url To Download The Developer Disk Image
Community-maintained versions are available on the mspvirajpatel GitHub repository . When you connect your iPhone to your computer,
The most reliable and community-trusted source for these files is the Theos SDK repository. Theos is a development framework, and they host a mirror of the necessary Developer Disk Images. Its primary function is to sign IPA files
– only per-version, community-mirrored files.
Starting with iOS 16, Apple changed the landscape significantly. They introduced a built-in toggle within the iOS Settings app. This effectively eliminated the need for users to manually download and mount separate disk image files for modern iOS versions.