Release record

iOS 5.1

Full article
Public release
Recorded milestones
4
Beta cycle
100d
Average interval
33d
Public release
Mar 7, 2012

Release notes

Overview

Editorial synthesis with inline references and a source ledger when citations are available.

iOS 5.1 added Japanese Siri support, Photo Stream deletion, more direct lock-screen Camera access, broader face highlighting, a redesigned iPad Camera app, new iTunes Match and iPad media controls, and targeted battery and call-audio repairs.[1]

Apple’s security bulletin documents additional protections for network requests, disk images, the application sandbox, DNS parsing, passcode lock, Safari Private Browsing, Siri on the lock screen, VPN configuration files, and WebKit.[2][3]

Source ledger

References

Sources are linked to the claims they support. Publication and access dates are shown when available.

  1. About iOS 5

    Apple Support · Apple · 2023-11-15T00:00:00.000Z · iOS 5.1

    Back to text ↑
  2. Apple security updates (2011 to 2012)

    Apple Support · Apple · 2023-08-10T00:00:00.000Z · iOS 5.1 Software Update — 07 Mar 2012

    Back to text ↑
  3. About the security content of iOS 5.1 Software Update

    Apple Support · Apple · 2023-11-03T00:00:00.000Z · iOS 5.1 Software Update security content

    Back to text ↑
  4. About the security content of iOS 5.1 Software Update

    Apple Support · Apple · 2023-11-03T00:00:00.000Z · iOS 5.1 Software Update

Documented & observed

Changes in this version

Source-linked features, fixes, known issues, removals, and community-observed behavior recorded across this version’s appearances and verified builds.

Release changes

Changed in this release

Features, fixes, removals, and regressions first observed in this release record.

bugFix · fixed

Deleting the active Newsstand issue

documentedconfirmed

The seed repaired a crash triggered by deleting the Newsstand issue selected for reading.

Recorded at Beta 1

  1. [1] iOS SDK Release Notes for iOS 5.1 Beta 1 (preserved PDF) · Newsstand — Deleting an issue that was marked as the currently reading issue could cause a crash

behavior · changed

Peer-to-peer service-discovery defaults

documentedconfirmed

Service-discovery APIs required explicit peer-to-peer inclusion instead of searching those interfaces automatically.

Recorded at Beta 1

  1. [1] iOS SDK Release Notes for iOS 5.1 Beta 1 (preserved PDF) · Networking — NSNetService class and CFNetService APIs do not include P2P interfaces by default

developerApi · introduced

Single-bundle Xcode preview

documentedcorroborated

The Xcode preview packaged its tools together inside the application instead of relying on a separate installer.

Recorded at Beta 2

  1. [1] Apple Releases iOS 5.1 Beta 2 to Developers · Xcode Developer Tools NEW — distributed as a single application bundle, Xcode.app

bugFix · fixed

Xcode documentation-organizer text entry

documentedcorroborated

Beta 2 marked the documentation-organizer exception from the preceding seed as repaired.

Recorded at Beta 2

  1. [1] Apple Releases iOS 5.1 Beta 2 to Developers · Xcode FIXED — documentation organizer causes an exception

bugFix · fixed

Network Link Conditioner service launch

documentedcorroborated

The network-conditioning service's post-install launch failure was marked repaired in Beta 2.

Recorded at Beta 2

  1. [1] Apple Releases iOS 5.1 Beta 2 to Developers · Xcode FIXED — Network Link Conditioner daemon cannot be launched

bugFix · fixed

Game Center profile-media loading

documentedcorroborated

The second seed marked the missing Game Center icons and profile pictures as repaired.

Recorded at Beta 2

  1. [1] Apple Releases iOS 5.1 Beta 2 to Developers · GameKit FIXED — App icons and profile photos are not loading in apps using Game Center

knownIssue · knownIssue

Setup Assistant reappearance loop

documentedcorroborated

Setup Assistant could return to its Wi-Fi or completion step just after setup had finished.

Recorded at Beta 2

  1. [1] Apple Releases iOS 5.1 Beta 2 to Developers · Setup Assistant NEW — Immediately after completing the Setup Assistant, it may re-appear

bugFix · fixed

Developer-tools removal while Xcode runs

documentedcorroborated

The second beta marked the removal script's overbroad deletion behavior as fixed.

Recorded at Beta 2

  1. [1] Apple Releases iOS 5.1 Beta 2 to Developers · Xcode FIXED — script mistakenly removes files and packages

feature · introduced

Photo Stream deletion

documentedcorroborated

Photo Stream gained on-device deletion, with removals propagating to other devices on the same beta.

Recorded at Beta 2

  1. [1] Apple Releases iOS 5.1 Beta 2 to Developers · iCloud Photo Stream NEW — Photos taken using iOS 5.1 can be deleted from Photo Stream
  2. [2] Apple Seeds iOS 5.1 Beta 2 to Developers, Enables Photo Stream Photo Deletion · Release coverage — addition of a much-requested feature related to the management of photos in the Photo Stream

knownIssue · knownIssue

Lock-screen camera shortcut state

documentedcorroborated

A lock-screen state could suppress the camera control after a Home-button double press.

Recorded at Beta 2

  1. [1] Apple Releases iOS 5.1 Beta 2 to Developers · SpringBoard Lock Screen NEW — double-clicking the home button will no longer bring up the camera button

behavior · changed

AT&T network indicator

documentedconfirmed

Apple records an updated AT&T network indicator without describing any underlying radio or throughput change.

Recorded at Public

  1. [1] About iOS 5 · iOS 5.1 — Updated AT&T network indicator

security · fixed

Safari Private Browsing history

documentedconfirmed

Visits produced through the pushState or replaceState JavaScript methods were prevented from appearing in browser history during a private session.

Recorded at Public

  1. [1] About the security content of iOS 5.1 Software Update · Safari — CVE-2012-0585

feature · introduced

Japanese Siri support

documentedconfirmed

The voice assistant expanded to Japanese, with Apple warning that availability could be limited during the initial rollout.

Recorded at Public

  1. [1] About iOS 5 · iOS 5.1 — Japanese language support for Siri

enhancement · changed

Camera access, face detection, and iPad redesign

documentedconfirmed

The lock-screen Camera shortcut was made continuously visible on listed devices, face detection highlighted all recognized faces, and the iPad Camera app received a new design.

Recorded at Public

  1. [1] About iOS 5 · iOS 5.1 — Camera improvements

bugFix · fixed

Battery-life repairs

documentedconfirmed

Apple lists battery-life bug fixes but does not assign them to a particular device, subsystem, or reproducible symptom.

Recorded at Public

  1. [1] About iOS 5 · iOS 5.1 — battery life

enhancement · changed

iPad media audio and podcast controls

documentedconfirmed

Apple optimized TV-show and movie audio for greater clarity and volume and added podcast playback-speed control with a 30-second rewind.

Recorded at Public

  1. [1] About iOS 5 · iOS 5.1 — iPad media and podcast controls

security · fixed

WebKit origin and memory safety

documentedconfirmed

The advisory groups fixes for cross-origin isolation and a broad set of memory-safety flaws, including cases capable of script injection, data disclosure, or arbitrary code execution.

Recorded at Public

  1. [1] About the security content of iOS 5.1 Software Update · WebKit — CVE-2011-3887, CVE-2012-0590, CVE-2011-3881 through CVE-2012-0635

bugFix · fixed

Outgoing-call audio reliability

documentedconfirmed

Apple corrected a condition that could occasionally cause audio to drop while placing an outgoing call.

Recorded at Public

  1. [1] About iOS 5 · iOS 5.1 — outgoing call audio

feature · introduced

Genius for iTunes Match

documentedconfirmed

The Music experience exposed Genius-created mixes and playlists to users with an iTunes Match subscription.

Recorded at Public

  1. [1] About iOS 5 · iOS 5.1 — Genius for iTunes Match subscribers

feature · introduced

Photo Stream deletion

documentedconfirmed

Photo Stream gained an explicit deletion capability for removing individual images.

Recorded at Public

  1. [1] About iOS 5 · iOS 5.1 — Photo Stream deletion

Release changes

Cumulative context

Broader context included for understanding, not claimed as new in this release.

compatibility · knownIssue

iCloud filename case handling

documentedconfirmed

Different filename case rules across Mac and iOS still created a cloud-document interoperability risk.

Recorded at Beta 1

  1. [1] iOS SDK Release Notes for iOS 5.1 Beta 1 (preserved PDF) · iCloud Storage — File names are case-insensitive in Mac OS X but case-sensitive in iOS

bugFix · knownIssue

Game Center profile-media loading

documentedconfirmed

Applications using Game Center could show neither their icons nor players' profile images.

Recorded at Beta 1

  1. [1] iOS SDK Release Notes for iOS 5.1 Beta 1 (preserved PDF) · Game Center — App Icons and Profile Photos are not loading in apps using Game Center

knownIssue · knownIssue

Protected-data cloud documents

documentedconfirmed

Cloud-document storage remained incompatible with files guarded by Data Protection.

Recorded at Beta 1

  1. [1] iOS SDK Release Notes for iOS 5.1 Beta 1 (preserved PDF) · iCloud Storage — files that are protected via Data Protection cannot be used with iCloud Storage APIs

Milestones

Release history

Every recorded channel appearance in chronological order. Open an appearance for any available build, scope, notes, and sources.

  1. Developer beta

    Beta 1

    Full articleEditorially verified

    iOS 5.1 Beta 1 is represented by 12 editorially reviewed, source-backed records from the 2011-11-28 milestone; unsupported routes and builds are excluded, while cumulative context is labeled explicitly.

    Availability
    available
    Sources
    16 linked
    Open this appearance
  2. +14 days

    Developer beta

    Beta 2

    Full articleEditorially verified

    iOS 5.1 Beta 2 is represented by 8 editorially reviewed, source-backed records from the 2011-12-12 milestone; unsupported routes and builds are excluded, while cumulative context is labeled explicitly.

    Availability
    available
    Sources
    13 linked
    Open this appearance
  3. +28 days

    Developer beta

    Beta 3

    Full articleEditorially verified

    iOS 5.1 Beta 3 is represented by 2 editorially reviewed, source-backed records from the 2012-01-09 milestone; unsupported routes and builds are excluded, while cumulative context is labeled explicitly.

    Availability
    available
    Sources
    9 linked
    Open this appearance
  4. +58 days

    Public release

    Public

    Source-linked recordEditorially verified

    The public iOS 5.1 update expanded Siri, Camera, Photo Stream, media, and carrier presentation behavior while addressing battery, calling, lock-screen, networking, and web security defects.

    Availability
    available
    Sources
    20 linked
    Open this appearance

Historical context

Cycle comparison

Pace, intervals, and duration compared with earlier releases on the same platform.

Historical avg for .1 releases

45 days, 5.3 milestones

Based on 20 previous iOS .1 releases

Cycle vs. platform average

100d (avg: 57d)

43 days longer than the iOS average

Duration ranking

#11 of 92

Middle of the pack iOS beta cycles

Longest gap in this cycle

58 days

Between Beta 3 and Public

Previous .1 releases (iOS)

Previous comparable iOS releases
VersionYearCycleMilestonesAvg. Interval
iOS 26.1202542d68d
iOS 18.1202491d1010d
iOS 17.1202328d75d
iOS 16.1202240d77d
iOS 15.1202134d67d
iOS 14.1202027d

Scroll horizontally to compare every historical field.

Official release notes