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AppSync patches MobileInstallation file on iPhone OS 3.x which is needed in order to install .ipa files manually without using iTunes. A new version of AppSync has now been released which is compatible with the latest iPhone 3.1.2 firmware. Make sure you have jailbroken your iPhone with firmware 3.1.2 before following the steps below. Complete step-by-step guide on how to jailbreak your iPhone with firmware 3.1.2 can be found here.

Here’s what you have to do to patch the mobileinstallation file on your iPhone:

Step 1: Start “Cydia” on your iPhone.

Step 2: Touch on “Manage” tab on the bottom.

Step 3: Now touch on “Sources” as seen in the screenshot below:

Cydia - MobileInstallation Patch

Step 4: Touch on “Edit”, and then on “Add”. You should now be prompted to enter a url source as seen in the screenshot below. Type “http://apt.macosmovil.com” and click on “Add Source”.

Cydia - MobileInstallation Patch

Cydia will now automatically update your sources by following a series of automated steps as shown in the screenshots below:

Cydia - MobileInstallation Patch

Cydia - MobileInstallation Patch

Step 5: After installation is completed. Search for “AppSync para OS 3.1(3.1.2)” in Cydia and install this application. This app will automatically patch mobileinstallation file on your iPhone running firmware 3.1.2.

Cydia - MobileInstallation Patch

You should now be able to install .ipa files manually on your iPhone running firmware 3.1.2.

UPDATE 1: Upon further investigation, I have found out that the original file version of “AppSync for OS 3.1(3.1.2)” which is posted at macosmovil repository is basically the same (v1.0) as the one posted earlier for OS 3.1, and both are compatible to work with iPhone OS 3.1.2.

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