Apple has just seeded the iOS 5.1 beta to developers a little over a month after releasing iOS 5. As most of you are aware, the software was crippled right out of the gate with a number of issues, including poor battery performance and Wi-Fi problems.

Two weeks ago, Apple finally released iOS 5.0.1 to the public after multiple developer betas. The new software was supposed to patch the battery bug, but the company later admitted that it didn’t completely resolve the issue. Will iOS 5.1 finally fix these flaws?

We don’t know yet, actually. We can’t access the changelog. All we know is that the 5.1 beta is available for the above-listed devices, and must be installed using iTunes 10.5. We also know that you can’t downgrade once you’ve upgraded, so jailbreakers beware.

It’s interesting that Apple skipped iOS 5.0.2 and went straight to 5.1. Typically, Apple uses tenth-place-only software (4.1, 4.2, 4.3) to incorporate new features. Maybe it is finally going to unveil iOS 5’s hidden Panorama picture mode or FaceTime over 3G.

Do you have a developer account? Make sure to let us know if you see any changes.

Update: iDB reader Jeremy Gonis commented and shared the full release notes of iOS 5.1. Thanks!

iOS SDK Release Notes for iOS 5.1 beta 1

Important: This is a preliminary document for an API or technology in development. Although this document has been reviewed for technical accuracy, it is not final. Apple is supplying this information to help you plan for the adoption of the technologies and programming interfaces described herein. This information is subject to change, and software implemented according to this document should be tested with final operating system software and final documentation. Newer versions of this document may be provided with future seeds of the API or technology.

Bug Reporting
Notes and Known Issues


iOS SDK 5.1 provides support for developing iOS applications and includes the complete set of Xcode tools, compilers, and frameworks for creating applications for iOS and Mac OS X. These tools include the Xcode IDE and the Instruments analysis tool among many others.

With this software you can develop applications that run on iPhone, iPad, or iPod touch running iOS 5.1. You can also test your applications using the included iOS Simulator, which supports iOS 5.1. There are two Xcode iOS SDK 5.1 images, one for installing on a Macintosh computer running Mac OS X 10.6.7 (Snow Leopard) or later, the other for installing on a Macintosh computer running Mac OS X 10.7 (Lion).

This version of iOS is intended only for installation on devices registered with Apple’s developer program. Attempting to install this version of iOS in an unauthorized manner could put your device in an unusable state.

For more information and additional support resources, visit:…

Bug Reporting

Please report any bugs not mentioned in the “Introduction” section using the Apple Bug Reporter on the Apple Developer website (…. Additionally, you may discuss these issues and iOS SDK 5 in the Apple Developer Forums: You can also access more information about iCloud for Developers at:…

Notes and Known Issues

The following issues relate to using the 5.1 SDK to develop code.

When creating an iCloud account, you can use any Apple ID as long as it is a full email address and not a MobileMe account. If you have a MobileMe account, you can move that account to iCloud. You can find more information at:

The NSNetService class and CFNetService APIs do not include P2P interfaces by default. To browse, register, or resolve services over P2P interfaces, an application needs to use the Bonjour DNSService*() APIs noted below.
Setting the interfaceIndex parameter to kDNSServiceInterfaceIndexAny in the following API’s will not include P2P interfaces by default. To include P2P interfaces, you must now set the kDNSServiceFlagsIncludeP2P flag when using kDNSServiceInterfaceIndexAny or set the interfaceIndex to kDNSServiceInterfaceIndexP2P. The affected APIs are:
App Icons and Profile Photos are not loading in apps using Game Center.

iCloud Storage
Provisioning profiles must be enabled for iCloud in the iOS Provisioning Portal. You can enable a provisioning profile for iCloud by navigating to the App ID section of the iOS Provisioning Portal and configuring your App ID for iCloud. After enabling the App ID for iCloud, regenerate your provisioning profiles to enable them for iCloud.
The setSortDescriptors: method of NSMetadataQuery is not supported.
In iOS 5, files that are protected via Data Protection cannot be used with iCloud Storage APIs.
File names are case-insensitive in Mac OS X but case-sensitive in iOS. This can lead to problems when sharing files between the two using iCloud. You should take steps on iOS to avoid creating files whose names differ only by case.
Movie Player
Starting in iOS 5.0, in order to facilitate finer-grained playback control, a movie player is not automatically prepared to play upon creation. Call the prepareToPlay method to prepare the movie player. For more information, see MPMoviePlayerController Class Reference

Music Player
Using shake-to-shuffle causes Music app to freeze and playback to stop.

FIXED: Deleting an issue that was marked as the currently reading issue could cause a crash.

In iOS 5, the signing of certificates with MD5 signatures is not supported. Please ensure that certificates use signature algorithms based on SHA1 or SHA2.

Xcode/Developer Tools
A bug in the documentation organizer causes an exception when you type in any field in the content area. To prevent the need to log in to the developer website from Xcode, download documentation sets locally using Xcode’s documentation preference pane and enable the ‘Check for and install updates automatically’ checkbox as a workaround.
“uninstall-devtools” script mistakenly removes files and packages even if Xcode is still running. Be sure to quit any running copy of Xcode before starting the “uninstall-devtools” script.
The Network Link Conditioner daemon cannot be launched after installing the Networking Link Conditioner without a reboot. You can manually workaround the issue with a restart or by the following command: sudo launchctl load /system/library/launchdaemons/]
In the iOS 5 development tools, it is possible to extract APIs used by an application and have them checked for use of private APIs. This option is offered when you validate your application for app submission.

  • if these new features are released, especially FaceTime over 3g don’t think ill ever jailbreak again. I have the 4s. As far as battery life is concerned 5.01 fixed the issue for myself and I don’t have a problem with wi-fi. well done Apple.

  • Anonymous

    There are tons of bugs out there just that you havent ran across.

  • rdqronos

    I still have a battery life issue, so I want to see if 5.1 fixes that.
    Not running it on my iPhone 4S, can’t downgrade from iOS 5.1 😛
    I’ll run it on my 4 🙂

  • Very Great! Thanks! However, I would like to know if the issue of Battery Life has merely been but a dismal to Apple, or if they have took the time to fix it.

  • Now if only someone can break this down in English :/

  • Anonymous

    Few errors I have come across:
    – When tapping the “X” when deleting an app, phone freezes for about 3-5secs.
    – Don’t know exactly in which case, but sometimes music player crashes and you cannot change song, only alternative is to completely shut down
    – When Banner is selected as “Phone Call” alert, no banner actually appears. Just the default alert.
    – Obviously the infamous battery drain, by which sometimes I can actually see my battery draining WHILE charging.
    – When scrolling up/down quickly in Safari, app crashes and goes back to Springboard.

    All this on a 3GS 5.0.

    PS: Could anyone explain me what the Semi-tethered tweak is for exactly? Because with it installed, and with it saying “Reboot covered” or so, I (voluntarily) rebooted the phone to try it out and eventually had to boot tethered anyways. So?

    • so you can use safari/mail… not cydia (this requires tethered)

  • I have experienced this ios 5.1 beta. Actually, the problem that Wifi is not improved since ios 5.0. It hesitated at times.

  • Anonymous

    tethered JB?? odd. it seems normally the Dev team has announced a new build for redsn0w by this time that will support a tethered jailbreak…

  • Anyone else having problems deleting photos?
    It can take up to 15 seconds sometimes when deleting just one pic. and its a reoccurring problem everything i delete pics.
    Anyone experience this?

  • Still don’t see anything about fixing Resuming Audiobooks from where they were left off…. gah.