Apple overlaps iOS versions from 7 to 28 days; the average is 13 days

No votes yet

Want to downgrade your device to iOS 8.4.1? Yesterday you could, but today you can't.

This is because Apple keeps a tight leash on iOS updates. During the install process, the device (or iTunes, or Configurator, or GroundControl) must verify some information with Apple, specific to both the device and the iOS build. Apple's servers analyze the info, then send back a one-time key to permit the installation. So at any time, Apple can stop "signing" the iOS update, effectively stopping all installs.

(This process doesn't affect you if you are already running the OS, only if you are installing or re-installing it.

After a new release, Apple always shuts down the old release. But it doesn't shut it down immediately. It waits a week or two first. I don't know the exact reason for the "signing window" to stay open. Maybe it's to give extra time for companies in the middle of a large deployment to get organized. Maybe it's to allow individuals who accidentally upgraded too early to change their minds. But when Apple stops signing that old release, it effectively forces your hand, and any iOS install then MUST go to the latest version.

Unfortunately, Apple has never announced in advance when it will stop signing an older release. This makes planning, well, a challenge.

To help (a little), we've compiled a history of how long Apple's kept that window open, after an upgrade. Maybe history will be a guide.

iOS Version Days as latest version Days still signed after update
iOS 9.0.2 n/a n/a
iOS 9.0.1 7 days n/a
iOS 9 7 days 7 days
iOS 8.4.1 34 days 14 days
iOS 8.4 44 days 11 days
iOS 8.3 83 days 7 days
iOS 8.2 30 days 27 days
iOS 8.1.3 41 days 16 days
iOS 8.1.2 49 days 14 days
iOS 8.1.1 21 days 9 days
iOS 8.1 29 days 14 days
iOS 8.0.2 25 days 7 days
iOS 8.0.1 1 day 0 days
iOS 8 7 days 28 days
iOS 7.1.2 79 days 9 days

iOS 9.0.2 out (so was iOS 9.0.1, briefly)

No votes yet

Apple yesterday released iOS 9.0.2, on top of iOS 9.0.1 a couple of days ago. (We forgot to post that!) iOS 9.0.2 patched a lock screen security vulnerability, and fixed a couple of bugs.

Release notes for iOS 9.0.2:

This update contains bug fixes and improvements including:

  • Fixes an issue with the setting to turn on or off app cellular data usage
  • Resolves an issue that prevented iMessage activation for some users
  • Resolves an issue where an iCloud Backup could be interrupted after starting a manual backup
  • Fixes an issue where the screen could incorrectly rotate when receiving notifications
  • Improves the stability of Podcasts

iOS 9.0.1 had the following to say:

This update contains bug fixes including:

  • Fixes an issue where some users could not complete setup assistant after updating
  • Fixes an issue where sometimes alarms and timers could fail to play
  • Fixes an issue in Safari and Photos where pausing video could cause the paused frame to appear distorted
  • Fixes an issue where some users with a custom APN setup via a profile would lose cellular data

Downloads of the latest IPSW for each device is available from our database of iOS Devices.

Always-On-VPN and global proxy not working in iOS 9

klatuu's picture
No votes yet

We use Always-On VPN with IKE 2 to reach our internal networks. Our internal networks can reach outside web servers only via http/https through our company proxy. This worked perfect until iOS 8.4.1. Some users upgraded their machines to iOS 9 and they told us "The internet is not working". We tested it and couldn't see any traffic to our proxies. iPads/iPhones try to resolve DNS and reach the servers direct. But our internal DNS Servers are not connected to the internet DNS Servers.
Just tested the function with iOS 9.0.2.

Still not working ! Very serious bug for company use of iOS devices.

Devices Intermittently Dropping Wifi

nberrios's picture
No votes yet

Hey All,

We have been experiencing an issue on our campus where Apple devices, and Apple devices only, are disconnecting and reconnecting to our wireless network.

This has caused huge issues for our teachers who are streaming content to Apple TVs. Every 5-10 minutes the wifi drops, causing whatever they are playing to stop and terminates the connection to the Apple TV.

We've experienced this issue with iPhones, iPads and Macs, both managed and not. We also have Dell desktops, Chrome books, and surface tablets deployed in the school and none of them seem to be experiencing an issue.

My network admin isn't sure where to start trouble shooting as it is only Apple devices experiencing the issue. I do know we use all Cisco Enterprise level hardware for the routers.

Any direction would be much appreciated!


GroundControl is hiring 1-2 mobility engineers

Aaron Freimark's picture
No votes yet

The next phase of GroundControl is beginning. I'm looking for 1-2 mobility engineers to work with me, helping large enterprises implement our software and save them from a world of pain. Must have MDM experience with Apple iOS devices. Best if you live in the New York area, too, but would consider remote workers. We are a small team today so you'd have a lot of impact!

E-mail me at aaron / at / groundctl / dot / com if interested.

Provisioning Supervisor Mode outside of OS X

mdmisthebest's picture
No votes yet

Does anyone know anything about how you can provision a device into Supervisor Mode a la Apple Configurator on Windows or other platforms? Thanks!

No-Apple ID, App Distribution by Device: Which MDMs have this already?

Your rating: None (4 votes)

One of the most anticipated features of iOS is the ability to distribute VPP apps to devices without Apple IDs, as long as certain conditions are met: device is on iOS 9, app was purchased through VPP, app developer opted in, MDM supports this feature.

What is unclear at this time is WHICH MDM providers support this feature today. As far as I can tell, very few were ready on day 1. Was yours?

Does your MDM support per-Device app distribution? Please post your MDM vendor and your experiences here. Maybe we can get them to prioritize this feature.

Server 5.0.3 Profile Manager - A server error has occurred after upgrade

betolley's picture
No votes yet

I upgraded to Server 5.0.3 yesterday. I previously was unable to sync new VPP purchased apps(Last couple weeks) and apple support said I had to updated before VPP would work again. So I upgraded. I am able to login and the apps are there. But randomly I get grey screen or "A server error has occurred." while working. Usually I get one of those errors instead of the page or button I click. I have monitored the log files after hitting load until I get the error: The server starts running version slow at this time. It is a i7 with 16gb of ram. Any suggestions? Any help appreciated.


(log follows below)

Resigning App on XCode 7 for IOS 9

Prashant3100's picture
Your rating: None (1 vote)

Does any one have issues with Resigning App on XCode 7 for IOS 9? I am seeing I am not able to install the app resigned on Xcode 6.1.4 on iOS 9. same when i do resign with xcode 7.

any suggestion?

Warning pop ups in iOS9

Creeze's picture
No votes yet


In iOS9, when you run in-house apps, a warning pops up that the developer is not reliable, and you need to go to Settings - General - Profile and mark the profile as "trusted" to run the app. Is this the only way to run the app? How to prevent this warning from showing up?

About the security content of iOS 9

No votes yet

Apple has published their regular inventory of security updates in iOS 9. By my count it is a new record of patches: 107 vulnerabilities.

Apple's been getting better and better at documenting and fixing security vulnerabilities. So please do your part and update your devices!

Source: Apple Security Updates

Custom APN settings incompatible with iOS 9

Jay991's picture
Your rating: None (3 votes)

Hi All,

"You can define a custom Access Point Name (APN) for cellular data access using either of two different configuration profile payloads – APN or Cellular. In iOS 9 you currently must use a Cellular payload for your APN profile. Apple plans to address this issue in a software update."

If you are affected by iOS 9 APN issue please refer to Apple's KB.

New Restrictions in iOS 9 — with sample Configuration Profiles

No votes yet

iOS 9 contains many new restrictions, especially for devices supervised by GroundControl, Configurator, and DEP.

Over at GroundControl's web site, I've posted a list of the new restrictions, plus sample configuration profiles for each. Want to lock the device name or wallpaper? Prevent the device passcode from being set or being changed? These are for you.

A few of the MDM providers will be ready on day 1, but if your on-prem solution may take some time to update, then you may use these files to bridge the gap.


Configurator Enterprise InHouse App Deployment Error

djoulz22's picture
Your rating: None (1 vote)

Hi all,

I have made an App I built with Enterprise profil.

When I deploy this app, I have the error : "The application could not be verified."

AMDeviceSecureInstallApplication (thread 0x10b23b000): Could not install package on device: kAMDApplicationVerificationFailedError

How could I verify the app?

Thanks in advance!

P.S. Sorry for my bad English, I'm just a French Smile

iOS 9 available September 16, new iPhones, bigger iPad Pro, new iPad mini 4, new Apple TV with apps...

No votes yet

Lots and lots today at the Apple announcements. This big one for this crowd is this:

iOS 9 available September 16

It's coming, and hopefully you've been up to speed on Apple's iOS 9 Checklist. (OK Seriously who has time for this?). Apple today not only released the Gold Master of iOS 9, they released the first beta of iOS 9.1. Time stops for no one.

The new Apple TV, available "Late October" comes with "tvOS" and runs Apps. Enterprise Apps are usable too, according to the updated license agreement. Does this mean MDM support for apps to Apple TVs?

Two new iPhones — 6s and 6s Plus — come 3D Touch (new gestures), Touch ID 2 (faster), better camera (12M pixels & 4K video), LTE Advanced and quicker WiFi. And pink.

A new 12.9" iPad Pro, with optional accessories Apple Pencil, and Smart Keyboard for those of you with Surface envy. No, that can't be the case, because Apple put Microsoft on stage to demo Office for iPad just after its introduction. (Which looks very cool using Excel and Word side-by-side.)

In case five iPad models makes your eyes cross, Apple has published an iPad comparison that may help. From what I can tell, there are 23 different combinations of capacity, size, and networking. And I'm skipping color options.

What did I miss?

About This Site

  • Enterprise iOS is a community for administrators of the iPad, iPhone, and related devices. All content is available to browse. We encourage you to create an account to submit stories, edit wiki pages, and post to our forum.

Comparison of MDM Providers

Recent Activity

Who's New