IPhone synced with another library..."Erase and Sync" question

I helped someone transfer from an older iPhone to an iPhone 6 and did an encrypted backup on my laptop and then restored that backup to their new phone.
When they took the phone home and tried to sync their library with it they got the following message:
"The iPhone ... is synced with another iTunes library on ... Do you want to erase this iPhone and sync with this iTunes library?"
I understand what iTunes is referring to but what does "Erase and Sync" actually do? Does it just erase any media i.e., songs, apps and videos and then resyncs them from the new library or does it completely wipe the phone and start from scratch?
Thanks...

When you say erased, you mean almost like a restore is done to factory settings instead of just the media being erased?
I ask because the older phone is no longer available and they want to preserve their photos, etc.
Can I backup the phone on their computer, select erase and sync and then restore from that backup?

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Copy all the content on your iPod back to your PC and into iTunes. Then go ahead and sync the iPod with your new library.
See this older post from another forum member Zevoneer covering the different methods and software available to assist you with the task of copying content from your iPod back to your PC and into iTunes.
https://discussions.apple.com/thread/2452022?start=0&tstart=0
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I plugged my iPod into the only PC it's ever been plugged into today, and it came up with "This Ipod is already synced with another library" when I tried to sync it. I tried a variety of solutions I found on the internet, but none seemed to work.
So, I decided to give in and do "Erase and Sync". Before I did that, however, I created a new encrypted backup of the iPod using the option in the iPod summary window. I erased the iPod and re-synced, so it has all of my music and apps on it now.
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I think that, for some reason, none of the backups that were being made are listed any longer. The only ones listed are four that have timestamps after I erased, one with the earliest timestamp that's the encrypted backup, and another without a time stamp that I'm also assuming is later. I might give that one a try, but I'm not sure that it will work...

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columbus new boy wrote:
How crap is that?
It's not crap at all.
It's not that simple. For example, I've 3500 songs on my MacBook but don't want them all on my phone, so I have to manually select each song again???
There has to be a solution.
Why not simply make a playlist with the songs you want on the iPhone?
and maintain a current backup of your computer.

"The iPhone is Synced with another library. Do you want to erase..."

My itunes library has a lot of music from my iPad. I want to move that music to my iPhone by managing my music "manually", but it says ""The iPhone is Synced with another library. Do you want to erase this iPhone and sync with this iTunes library?"
I read that I have to back it up, then go ahead and erase the phone, then you can add the music from the library to your phone. Is this true? Will it work?
I have backed up the phone to iCloud, but I'm worried still. How can I be SURE that I'll get everything back when I restore the phone after erasing it?
Thanks!

I'm afraid the LU suffix is a new one on me.
As long as you have all of the content in your library then that remove and sync warning shouldn't cause any loss of data, but it shouldn't be happening every time. It may pay to take the following steps to reset the connection between the two,
Backup device.
Restore as a new device.
Restore the backup made earlier.
Again, this assumes all content on the device is in your library. If that isn't the case see Recover your iTunes library from your iPod or iOS device first.
tt2

Trying to add playlist to iPhone. The current music on my iPhone is synced with another library. How do I add my playlist without erasing all of the music currently on my iPhone?

Trying to add playlist to iPhone. The current music on my iPhone is synced with another library. How do I add my playlist without erasing all of the music currently on my iPhone?

iPhone is designed to sync with one computer only, if you sync with another, all your content will be erased and replaced by whatever is on that computer.

Iphone says it is already synced with another library, but it's not

My iphone says it is already synced with another library, but it's not.

I have the exact situation and it is frustrating me. All I want is my original iTunes Library back!
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My itunes says that my ipod is synced with another library when it is not and cannot update or sync without wiping it and all its data

My itunes says that my ipod is synced with another library when it is not and cannot update or sync without wiping it and all its data
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Syncing to a new iTunes library or computer will erase your ipod. Only if you back up your iPod manually before syncing, you can restore your device from that backup again. A manual backup does not include the sync process.
Do this:
Disable autosync in iTunes, connect your iPod to your new computer and right click on it in the device list and choose backup. iTunes will backup your iPod without syncing.
Transfer your purchases the same way, choosing "transfer purchases" this time.
All media content will be erased during the first sync, but you can restore your settings and app data from your manual backup afterwards.
Don't forget to set up at least one contact and event on your new computer to be able to merge calendars and contacts when you sync the ipod for the first time.
Music is one way only, from the computer to your device, unless you bought the songs in itunes and transferred your purchases.
There is 3rd party software out there, but not supported by Apple, see this thread:http://discussions.apple.com/thread.jspa?threadID=2013615&tstart=0

Iphone thinks its synced with another library...???

i always used my iphone with my PC, which has only one library. I don't keep any music in the library anyway - after transferring music to iphone, i delete it from the library since i don't use iTunes to listen to music. i've been doing it this way for years and years, managing everything on it manually through the "manually manage music and videos" option.
Now, suddenly after I connect my iPhone, I can't add anything to it, can't delete anything from it, can't change or edit ANYTHING... all I can do is listen to the songs on it on iTunes, that's it. I also noticed "manually manage music and videos" was no longer checked, and when I check it and click apply it tells me that the iPhone is synced with another library and I need to delete everything on it to sync it with this library... but NOTHING HAS CHANGED. I don't know why this is... nothing changed with the computer or hardware. Tried restoring my iPhone back up from 5 months ago, didn't help (only made it worse), I don't know what to do.... I don't want to delete everything and put it back again after... does anyone know how to fix this?
note: I can add music through the "autofill" option but that's it... I can't create/delete playlists, delete songs, edit song info, or anything else, it's driving me crazy...
If anyone had this similar issue and managed to get it fixed, please let me know... this is driving me crazy... definitely my last Apple product.

I'm not sure exactly why the setting for Manually Manage Music changed, however, when you change from Sync music to Manually managing music, you will get that error message because it will remove all music from the device so you can manually manage it. Your other issue is the fact that you have removed all of your music from the library. When you restore the phone, or update the software, at times the phone will need to resync your music because that is not contained in your backup, just a setting about the music. If your device tried to resync music, it would find there is none. Also, I'm not so sure why you cannot delete music, but I'm guessing that since you say all you can do is listen in iTunes is that you cannot listen using the Music App?
To be honest, I'm not sure if there is an answer to this, least ways one that you would like to hear. I would see if anyone that manually manages music on their device can provide better information. This is the best that I can say.

HT1689 error message iphone synced with another library

when i connect my phone to itunes,it says its synced with another library.how can i change this??

When you say erased, you mean almost like a restore is done to factory settings instead of just the media being erased?
I ask because the older phone is no longer available and they want to preserve their photos, etc.
Can I backup the phone on their computer, select erase and sync and then restore from that backup?

PC hard drive died and I have replaced it. Need to import the music on my iPod, but get a message that it's synced with another library (old hard drive). How do I import the music onto new hard drive? Senuti's just for macs.No old hard drive to copy.

My PC hard drive died and I have replaced it. Need to import the music on my classic iPod, but get a message that it's synced with another library (old hard drive). How do I import the music onto the new hard drive? Senuti (one respondent's suggestion) is just for macs. I have no old hard drive to copy to the new hard drive (another respondent's suggestion.)

See this older thread from another forum member Zevoneer on different ways to copy music from your iPod back to your PC.
https://discussions.apple.com/thread/2417169?start=0&tstart=0
B-rock

I have a long-existing iPhone 4s with one apple id and started a job where I received a macbook with another apple id. how do i get my phone to sync with the Mac Pro and secondly how do i get my music on there?

i have a long-existing iPhone 4s with one apple id and started a job where I received a macbook with another apple id. how do i get my phone to sync with the Mac Pro and secondly how do i get my music on there?

No not bothered about sycing apps etc it is all about calendars and maybe notes. IN terms of how its done I just want it the easiest way and preferably so that if an entry is made on one calendar then it populates the other.
Thgius is beacuse I have my work diary on outlok, which I then link with my ical. I want to make sure that information is then shared with her.
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My computer was reimaged and iTunes was deleted, now when I try to sync my ipad it says it is synced with another library? How do I sync with the newly installed iTunes without losing all of my data on my ipad?

My computer was reimaged and iTunes was deleted, now when I try to sync my ipad it says it is synced with another library? How do I sync with the newly installed iTunes without losing all of my data on my ipad?

Copy all the content on your iPod back to your PC and into iTunes. Then go ahead and sync the iPod with your new library.
See this older post from another forum member Zevoneer covering the different methods and software available to assist you with the task of copying content from your iPod back to your PC and into iTunes.
https://discussions.apple.com/thread/2452022?start=0&tstart=0
B-rock

IPhone synced with another library..."Erase and Sync" question

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