Unusable UDID in new ios7 (with FFFFFFFF prefix)

ios7 udid
Unmerciful picture Unmerciful · Oct 25, 2013 · Viewed 17.6k times · Source

I need to register new device because I need mobileprovision. I can't use mobileprovision because UDID has FFFFFFFF on start. I think it is wrong UDID.

Any idea how to fix it?

Answer

DerWOK picture DerWOK · Nov 8, 2013

Yes. The "FFFFFFFF" UDIDs are wrong. This seems due to the fact that the UDID is now considered a Privacy Topic and thus Apps are not allowed anymore to retrieve them... and iOS returns an obfuscated UDID if called and precedes the first digits with FFFFFFFF. So I guess some of your clients got the UDID via an App on the device.

See here: https://stackoverflow.com/a/19032885/2580805 "The only & unique method to get UDID under iOS7 is to plug your device to a computer, launch iTunes (or Xcode) and copy the displayed UDID."

But I have to add: there are at least two more options:

  1. Our testers that provided their UDID by registering their devices via TestFlightApp.com also got non-FFFFFFFF UDIDs that worked.
  2. Testers can surf with their device's Safari to: http://udid.io - this site installs a (temporary!) profile on the device which allows it to show the user a working UDID for copy & paste.

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