How to reset sync status of iDevice without wiping it?

Question

Ok, iTunes 11.1 syncing seems to be a lot better than it used to be, it no longer seems to want to wipe your iDevice every time you click on a setting ("enabling sync for music will erase all apps on your device, are you sure you want to do that?  "No" - "ok, not syncing music, wiping all your apps, you're welcome!").
Now, when you connect a device (say, an iPad) to iTunes that's never been synced before, it pops up to ask if you want to set it up as a new iPad or restore from an existing backup (if any exist).  You can't do anything else at that point.  Obviously, if you've already been doing stuff on it you don't want to restore, so you say to set it up as a new device.  This will immediately do a backup and transfer all apps that you already have loaded on it.  So far, so good, this is much better than the way it used to work when you want to pair it with iTunes for syncing, it used to want to wipe everything you'd done out when you first turned on sync on a device that you had already been using.
The problem is, if you DON'T want to sync with this computer, you don't get a choice - you can't go in to manage your music, for instance, without syncing apps.  In addition, as far as I can tell, you can't have it sync with another computer (or different iTunes library) without completely wiping the device and losing all your data, have to reload all your apps, arrange them on home screens and folders, etc.
So - when it's first asking if you want to set it up as a new device or restore from a backup, it should also give you a third chocie of "don't sync with this computer".  However, that doesn't solve my problem, since I'm already syncing with an iTunes library.
The way I use iTunes sync, I have several devices all syncing (apps only) to the same iTunes library - this way, I only download new or updated apps once, sync that device first, then later ones pick up the updates (and manually add new ones, I don't have it "Automatically install new apps", as I often have apps that are only on one device).  With iOS7, I want to put it on only one of my devices initially, and update apps only on that one, so I need to switch it to sync to a different iTunes library so that the other devices won't pick up the updated apps when they sync.
There's no setting to un-pair a device so it can be connected to an iTunes library as if it had never been synced before.  If you connect it to a different iTunes library, you can still transfer songs, back it up, transfer purchases, remove, install and update apps.  You can even tell it to sync other things (Contacts, Bookmarks, didn't explore that thoroughly as I don't sync anything but apps).  In other words, you can do EVERYTHING you could do with the Sync button, except that you have to do them manually (and find all the updated apps in your library to be sent to the device).  Pressing Sync doesn't give an error, it just goes through 3 steps, very fast, and does nothing (unless you've turned on some of the other sync options).
So, as a work-around (a really stupid work-around, it's absolutely dumb to have to do a full restore in order to change ONE little setting, and restoring from backup doesn't always restore everything, there are some apps which are poorly designed), what would I need to modify in the backup to un-pair it, remove the iTunes Library ID or whatever it is so that connecting it to iTunes will think it has never been synced to iTunes before?  I know how to find specific files in the backup, I just don't know which one and which value to change.
Or is there some way I'm missing to un-pair a device from an iTunes library, other than a full reset (which loses all your data)?

Answer 1

Hi LayzeeBird
Welcome to BlackBerry Support Forums
You have to remember and enter the correct password that you have set in your device, By no other mean you can access or reset the device password . If you fail your device will initate a wipe process deleting all data within your device. I think you might have a mixture of different characters in your password,and you are unable to enter those on the BlackBerry  keyboard. For example , if your password is
  Lay123
And you enter L > a > y > alt > 1 > 2 > 3 
 the actual result will be
Lay1er
You must enter
L > a > y > alt > 1 > alt > 2 > alt > 3
 to get Lay123 on your device.
So, while on the BlackBerry  keyboard you think you are typing Lay123, you are actually typing Lay1er
Please think carefully and try to enter it again correctly . If you fail in this process and if you have a backup of your device then after a wipe you can restore it.
Good luck.
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