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

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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.

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497 replies

Jan 22, 2024 6:07 PM in response to BobUlius

BobUlius wrote:

I was hoping and EXPECTING with all the users with this issue the "stuck on preparing to sync" would be fixed in 17.3. It is not. Both disappointing and showing a lack of responisibility for their customers.

Now, in the process of trying to fix this i have made it worse.

My phonwe and outlook always synced esily and as expected. Trying to fix this I ** two things: Unchecked sync contacts and tried reset sync. Both several times. When I rechecked sync contacts I get several possible erros. Tonight's : this will change more than 25% of you contacts on this phone. Add 22, delete 191 and something else for 6. I cancelled that.

Is it possible to get back into sync? I am reluctant to try one toime replace contacts on computer from this phone. Can I trust that?

Appreciate any insight. There are several similar threads on this hear so forgive me for posting more than one, but woul dlike visibility to fix this problem.

Thanks.

Are you using iTunes on a PC.?

if so,I think you guys on a mixed environment (iPhone and iTunes on a PC with Outlook ) are having the worst of it.

I wouldn’t trust anything to work as you expect

Jan 26, 2024 10:09 AM in response to Norman18

I have been experiencing this problem for well over a year, not only with my iphone but my ipod(s) as well. There are little things that can be done on my end to fix it but I have to do it every time. What is taking so long with the 'apple engineers and them fixing this? I have received coutless updates for my phone and a few for the ipods, but you cant seem to fix this problem. What the ****?

Jan 27, 2024 3:49 PM in response to Niall Mallyon

I think it’s always been the case that the backup step of the sync is omitted if a recent backup already exists.


When trying various settings and repeatedly syncing I noticed the time stamp on the “Last Backup….” does not change. I don’t think it makes any difference whether you back up to iCloud or your Mac.


And after the OS and iOS update sometimes Step 2 Preparing ….. takes a long time (several minutes) and sometimes it doesn’t .

Jan 28, 2024 11:31 PM in response to Norman18

I don't know if this will help but I have just discovered, completely by accident, that if you click the Apple icon/Go/Airdrop my iPhone 15 Pro shows up in the sidebar. When I clicked on it the whole iPhone screen shows up. I tried an experiment by going to Music/Playlists and selecting a playlist that I didn't have on my iPhone..... and it worked! The playlist was on my iPhone. I will be using 'Airdrop' from now on the sync my iPhone...

Feb 17, 2024 11:12 PM in response to Norman18

There is a solution, but Apple removed my post (I understand why). I can confirm that the solution worked without any user intervention. My advice, as Apple supports would be if trouble shooting with them, is that the first step is to make sure your devices are up to date. The ‘up-to-date’ that they are now may not fix the issue, but when you’re aware that there is a new software update for iOS, make sure you do and try the Sync again to see if the issue is resolved.

Feb 17, 2024 11:39 PM in response to Jay Batson

There is a solution, but Apple removed my post (I understand why). I can confirm that the solution worked without any user intervention. My advice, as Apple supports would be if trouble shooting with them, is that the first step is to make sure your devices are up to date. The 'up-to-date' that they are now may not fix the issue, but when you're aware that there is a new software update for iOs, make sure you do and try the Sync again to see if the issue is resolved.

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"

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