iPhone 15 Plus stuck in “Preparing To Sync"

Just upgraded iPhone 15 Plus to iOS 17.2 and am unable to sync music from Mac Mini also just updated to Sonoma 14.2. Operation seems to stall out at Step 2 of 4 “Preparing to Sync”. No further progress even after 3 hours. Shut down iPhone and restarted, then tried sync using cable, then re-tried sync using Wi Fi without success. Any ideas?


[Re-Titled by Moderator]

iPhone 15 Plus

Posted on Dec 12, 2023 6:21 PM

Reply
Question marked as Top-ranking reply

Posted on Dec 26, 2023 6:41 AM

Hello,


I have the problem since iOS17 (still with iPhone 13 Pro) and Watch OS 10 (Ultra2).


The change to the iPhone 15 Pro and a complete reinstallation of the iPhone did not bring any improvement. The strange thing was that the "fresh" iPhone (without any apps installed, no backup installed) could initially be synchronized just as easily as an iPhone SE, an iPhone SE3 and an iPad Pro 11 3rd. This actually made it clear that the problem could not be due to my computer configuration, especially since it also occurred on another notebook and with another Windows user. Nevertheless, I have gone through all these options together with Apple support.


When I had only installed my most essential apps on my iPhone and paired it again with my Ultra 2, the synchronization went wrong again. Out of sheer desperation, I tried to decouple my Ultra 2 again and, lo and behold, the synchronization ran completely smoothly and all data (including diagnostic data) was synchronized again. As soon as I had paired the Ultra 2 again, the same mishap. This morning, Apple support also confirmed to me that there is a problem that is being worked on in this context.


My workaround to the solution:


  1. Start iTunes on PC
  2. Connecti the iPhone
  3. Start synchronization and wait until the sync at step 2 "... prepare..." hangs
  4. Disconnect the usb cable to the iPhone and wait until the sync process in iTunes is finished.
  5. Reconnect iPhone (! Don't close iTunes in the meantime!)
  6. Start synchronization again, now it runs through without any problems


My explanation: After every restart of iTunes, iTunes apparently tries to load the diagnostic data onto the PC during the first sync operation of a device. This obviously does not work (for me) with paired Ultra 2. Therefore, the "killing" of the mdcrashreport tool in the task manager leads to the continuation of the sync. It seems as though access to the diagnostic data is blocked by pairing the Apple Watch. (Just a hypothesis)


Why do I prefer to disconnect the cable instead of using the task manager? When killing the tool in the task manager, the current sync continues to run, but the next sync runs back into the same problem because iTunes does not transfer the diagnostic data or the mdcrashreporttool does not register as performed. If, on the other hand, you pull the cable, iTunes seems to regard the mdcrashreporttool as performed and does not try to pull the diagnostic data from the iPhone again at the next sync. I.e. As long as I don't close iTunes, I can always sync my iPhone without any problems. If I close iTunes, the sh… starts all over again.


Which way you choose is, of course, a matter of taste. A fast solution would be very desirable.

Similar questions

497 replies

Jan 6, 2024 4:35 AM in response to Norman18

Worked perfectly for me, thank you so much for working out a solution. I'm rather disgusted that this issue has been around for so long and Apple haven't sorted it out. I thought it was my new phone as I didn't have the problem syncing my iPad using the same Mac. We all pay a fortune for these Apple products and yet issues like this linger.

APPLE - SORT IT OUT!!!

Jan 6, 2024 6:00 PM in response to Norman18

Thanks xCowboy. Your solution worked for me. However this is very disappointing by Apple. I am somewhat cynical but it does seem like there is little incentive for them to ensure a smooth sync / backup process as they probably want to encourage us all to use streaming services and over the air backup services...


@apple please sort this out. it's not good enough.

Jan 7, 2024 9:52 AM in response to Norman18

I have a new Windows 11 Laptop and a clean install of iTunes. Every time I try to sync my iPhone 15 Pro I have to force quit the file MDCrashReportTool.exe and as expected the sync continues without a problem...


BUT (and this is weird) if I rename the file MDCrashReportTool.exe and start iTunes, that works fine, I get no warning or anything during a sync with the iPhone (which is great) ..... BUT the iPhone local (encrypted) backup does NOT show up in Edit-Preferences-Devices.

If I rename MDCrashReportTool.exe back to its original name, the local iPhone backup shows up when I next load iTunes! (but of course I then have to force quit MDCrashReportTool.exe whenever I want to sync my iPhone)

What the heck!

Go figure?

Why does Apple not sort this out - it's not as if it's a new issue or probably even difficult!

PS I do own an Apple Watch 7 if that makes any difference?

Jan 8, 2024 4:29 PM in response to JammerDJC-01

I'm also on Windows, and decided not to rename the MDCrashReportTool since I'm getting iTunes from the Microsoft Store, and wasn't sure what might happen if the MSStore decides to update iTunes -- would it restore the MDCrashReportTool at the same time? But I also didn't want to keep opening up TaskManager and hunting for the crash tool and killing it -- so I wrote this little PowerShell script to hunt for it and kill it for me. It's much more convenient. Here it is in case it helps anyone else:


$process = Get-Process MDCrashReportTool -ErrorAction SilentlyContinue

if ($process) {

$process | Stop-Process

} else {

Write-Host "MDCrashReportTool is not running."

}


Of course, this assumes you have PowerShell and know how to use it, but I figure, if you know how to open TaskMgr, you probably know how to run pwsh scripts too.


So my workflow is: connect my phone, start to sync it with iTunes, then run this script to get past the MDCrashReportTool blockade, and voila, no blockage. It's a little (but admittedly not a whole lot) easier than hunting for the process in TaskMgr, IMO.

Jan 9, 2024 2:00 PM in response to karstene69

This solution worked perfectly the very first time I tried it. Thanks you so much for putting it on here. I had a call into Apple support and was almost going to cancel it but decided to speak to him to tell him about the problem and explain that many people are having the problem and that a fix is needed. He said he noted the problem. I won't hold my breath waiting for Apple to come up with a fix, but so glad I saw your workaround solution. Thank you agian!

Jan 10, 2024 4:54 PM in response to xCowboy

Thanks so much!!! This saved me a lot. iTunes (12.9.5.5 on Catalina)) got stuck in Preparing to Sync and so I forced-quitted it. After that the iPhone (15 Pro) was no longer recognized by iTunes and the app was asking me to rest the phone to factory settings. Luckily, I didn't. Installed a new copy of iTunes (from Retroactive 2.0) and then got stuck again... I saw your solution and it worked beautifully. Phew!

Jan 11, 2024 5:54 PM in response to Canaanski

Canaanski wrote:

Sounds like this has to be done every time.

I don’t think anyone has come up with a “one time” workaround. Some folks think this problem is related to he Apple Watch. My theory is that it’s related to diagnostic and log data, which hangs around for at least a week and causes problems in the sync which causes the crash report tool to hang. But that’s just my WAG.

This thread has been closed by the system or the community team. You may vote for any posts you find helpful, or search the Community for additional answers.

iPhone 15 Plus stuck in “Preparing To Sync"

Welcome to Apple Support Community
A forum where Apple customers help each other with their products. Get started with your Apple Account.