In order to install the application from an .ipa file outside AppStore, the UDiD of the device must be verified. In order to read the device’s UDiD, you must go through a few simple steps. First connect the device to the computer and run iTunes. If you do not have iTunes installed, the installation manual is available on the Apple website. Once the program is launched, select the device which you want to read the ID from. Then click on the serial number until the label with the UDiD is displayed. When the UDiD appears, right click on it and select Copy.