Trampoline

Trampoline is the codename for the iPhone 5's OTA Update Enabler. iOS 6.0 on the iPhone 5 apparently included a bug that prevented OTA updates from occurring properly. As a result, Apple made the OTA update process a little less straightforward.

Trying to perform an OTA update informs you about the updater app, and how to obtain it.

Process

• Spawn by update daemon (causes elevated privileges)
• Mount Disk Image /Applications/iOSUpdater.app/iOSUpdaterHelper.dmg at /Developer
• Copy contents off (essentially cp -r /dev/{DMG}/* /)
• Reboot
• Daemon runs and patches files
• Daemon deletes Trampoline
• Reboot

iOSUpdater.app Notes

• Placing it in iTunes and adding it to the device will allow the update.
• Updater can't be deleted on device, but can with iTunes.
• Requires elevated (root) privileges (as far as I can tell)
• Update doesn't work if app is installed with iTunes and removed after (with iTunes).
• Update does work if app is installed with iTunes and started via the app.
• Deleted on successful update to 6.0.1 (10A525).

• iOSUpdater.app synced via iTunes on iOS
• 

  iOSUpdater.app on SpringBoard

• 

  iOSUpdater.app on SpringBoard (trying to remove)

• 

  iOSUpdater.app after started from springboard

• 

  OTA Update Error

External links

• http://mesu.apple.com/assets/trampoline/manifest.plist
  • iOSUpdater.ipa

Install

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