The iPhone "..." could not be synced because the sync session failed to start

Same problem here. Phone will only accept factory restoration after upgrade to beta 2. Tried every combination of ios/itunes beta.

For reference, this is what I did;

* First I upgraded iTunes to beta2 and my phone stopped syncing with this error. Realized my mistake by reading this thread and removed iTunes beta2 (for some reason dragging to trash didn't do anything whatsoever so had to locate the folder and remove by entering my root password)

* Reinstalled iTunes beta 1 and synced/backed up my iPhone and iPad, no problems syncing so I knew I had an up to date backup.

* Upgraded iTunes to beta2 by just running the installer. Phone stopped syncing again, but I just ignored it this time.

* Restored the iPhone and iPad to iOS beta2 (ie not upgrade, I held down alt and pressed the restore button)

After that it went like a regular restore (ie it factory reset, read the backups back and synced my apps just fine) and both iPhone and iPad now seem to be syncing happily over WiFi.

me too... mac with itunes b2 and iphone 4 with b2, they don't sync showing quoted message...

I have the same problem with an Ipad 2.and Beta 2. I have reinstalled IOS B1 on the Ipad and I would like to reinstall Itunes 10.5 b1 for Windows but i cant find it anywhere.Any idea?

Sorry, it looks like sub replies aren't pushed to email notifications. I'll try this again...

Message was edited by: cmayer17

Ok, so it seems like some people are having this problem and some aren't. We should find something that we (the people still having issues syncing) have in common. Did everyone here have an almost completely filled up device before trying to upgrade? It could be that this software update added bulk and there's just not enough space.

the idea is good, but i really can't find anything to start with ... to answer your question: my iPhone was only half way filled.

also i have tested with MAC OS X 10.6.7 and 10.6.8 ... there's no difference.

i re-installed iTunes ... no difference.

tried syncing over the air and via usb ... no difference.

however my iPad 1 with firmware 4.3.3 syncs just fine on iTunes 10.5 beta 2 😕

any other clues?

Dangit. I tried restoring to a non-beta backup and turning off iCloud with no results. I also tried reinstalling iTunes and the beta in different orders, nothing. Maybe to folks at iModZone can help us out, they have an IRC chat room with lots of people who have the new beta.

I forgot to update to iTunes 10.5 beta 2 in the first place. My iPhone 4 iOS5 beta 1 can sync and update to 5.0 beta 2 just fine. But after the update, it won't sync at all.

So I updated to iTunes 10.5 beta 2 and sync the iPhone 4, everything work flawlessly.

But not with my iPad 5.0 beta 1, I got the same error message as yours. It won't sync at all.

I try to backup everything before the update. So I won't destroy my game save files.

Here is what I did

1. I uninstalled iTune 10.5 beta 2 by dragging it to the trash and enter my password. Empty the trash. iTunes Helper popup might appear, kill that process.

2. Install iTunes 10.5 beta 1 then sync and backup.

3. Install iTunes 10.5 beta 2 and Option+Restore the iOS 5.0 beta 2 firmware

If same error appeared again, redo (1.) and then install 10.5 beta 2 again.

4. Restore from backup you just created.

🙂

ok, got a little workaround, so i'm able to get my music, podcasts etc. back on the device: it is possible to sync iOS 5 beta 2 with iTunes 10.5 beta 1 (although over the air sync is not possible of course) ... i won't update to iTunes 10.5 beta 2 till it's fixed ... not the perfect solution, but it works for the moment.

really? because I tried the same thing and it gave me an error message saying that I needed a newer version of iTunes.

yes, i'm syncing the rest of everything right now ... i first killed iTunes and iTunesHelper, then deinstalled iTunes completely and installed iTunes beta 1 afterwards ... now syncing is possible again.

I fixed my issues by copying the ios2 restore.ipsw beta to itunesb2 library/itunes/iphone software update folder, them holding ALT then restore within itunes2 beta, then manually selecting the iosbeta2 in the folder above.

This process will break if you use xcode.

i couldn't resist trying if i can sync on itunes 10.5 beta 2 after the sync in beta 1 ... and sadly this is not working. now i'm back on itunes beta 1 and iOS 5 beta 2 with sync working. if someone has a better solution, then please post ... i tell you exactly what i've done now and then i'm out for the moment 😉

don't know which steps are actually important, but this is everything i've done:

1. install mac os x 10.6.8
2. (if you're on iTunes beta 2) kill the iTunes and iTunes Helper processes
3. deinstall itunes beta 2
4. install itunes beta 1 and start it
5. connect your iDevice
6. sync it (should work now)

i follow this step for restore a device with b1 for upgrade to b2:

NOTE: i've used two macs, the first (imac) with itunes 10.5 b1 and the second (macbook) whit itunes 10.5 b2

1- on imac, i synced and i did a full backup of my device, do it twice for security

2- i pluged the device to macbook and restore (option+restore) with b2

3- just after the device's reboot, i've pluged this device to imac

4- follow the step for restore from previus backup

for me, work for all device and i hope this is usefull for you...