Cannot back up iPhone with new O/S 4.0.2

I download the new software, no problem.
it says its extracting the software no problem
then when I try to sync I get 2 error messages
iTunes cannot back up the iPhone because an unknown error occurred (-20)
that messages comes up twice the second time tells me to disconnect and reconnect the iPhone and try again. which of course I did and nothing changed. I also tried all 4 usb ports on my laptop. which of course is a PC unit. I can only assume that mac users have none of these problems....
anyone else have these issues and what did you do???

Did you check your security software settings?
Error 20, 21, 34, 37: These errors typically occur when security software interferes with the restore and update process. If you are using a PC, follow this article (http://support.apple.com/kb/TS3125) to resolve this issue.
copied from http://support.apple.com/kb/TS1275 , Update and restore alert messages on iPhone, iPad, and iPod touch

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Cannot back up iPhone with broken screen (asking for password).

So I have pretty much destroyed my phone in a biking accident. It somewhat functions, but the screen is so badly damaged that I cannot operate it. It destroyed the frame enough that it cannot read my sim card for what it's worth. Anyway, I wanted to perform a last backup before I got rid of this thing and it is asking to put in my password on iTunes. The problem is that I cannot type it in cause my screen is so far gone. Any options for me?
Also, is there a way to wipe it clean without using the screen?

Same thing happened to me: broken screen on iPhone 5; iTunes prompted me to unlock phone when attempting to do a tethered backup & sync; same computer I always did backups/syncs on and didn't need to unlock phone before screen was broken. My solution, because the phone looked otherwise fine (doesn't sound like yours is though) was to remove my girlfriend's iPhone 5's screen and temporarily replace my broken screen with hers (followed iFixit tutorials). Everything worked (good thing, otherwise I promised I would buy her a new phone) and sync w/ backup started without me having to unlock the phone, then I put the screen back on the original device and now I'm waiting for my iPhone 6 to come 9/19 and I'll restore from backup. So the broken screen was obviously the thing that triggered iTunes to not allow a backup without unlocking. Another sign something was wrong before I swapped screens was when I connected the broken phone to the charger: I got a repeating charging-bong sound going off at about a three second interval between bongs.

Cannot back up iphone with itunes because error occured

After updating ios6 i can no longer use wifi. Imam trying to back up phone so i can restore, but it says an error has occured. Any suggestions?

Did you check your security software settings?
Error 20, 21, 34, 37: These errors typically occur when security software interferes with the restore and update process. If you are using a PC, follow this article (http://support.apple.com/kb/TS3125) to resolve this issue.
copied from http://support.apple.com/kb/TS1275 , Update and restore alert messages on iPhone, iPad, and iPod touch

When i try to back up my iphone 4 it says i cannot back it up with the error code -50

when i try to back up my iphone 4 it says i cannot back it up with the error code -50? HELP

If you are running Windows and it stops on the first stage of a sync then my suggestion is to uninstall AppleDeviceSupport version 2.0.1 and re-install 1.5.2.
There are instruction here to do it on Windows 7 (see the first post):
https://discussions.apple.com/thread/3280228?tstart=0
Those instructions are to fix a different problem, but it fixes the problem with syncing devices stopping on the first stage (backing up the device) too. The AppleDeviceSupport 2.0.1 comes with Quicktime 7.7 and, I believe, the latest Safari version.
I'm running XP, so used the Everything search program (http://www.voidtools.com/download.php) to find the directories with the AppleDeviceSupport installers (they have the extension .msi and the version in the directory name) and right-mouse-buttoned them to do the uninstall and install. Note you need a reboot afterwards. (Actually I just sorted out the service in the Service Manager, but that's a longer explaination and a reboot works fine).
Hope that helps,
John

HT1386 My system got crashed and I dont have backup fo my iphone.... now how do i synch my iphone with new itunes without loosing my data ?

My system got crashed and I dont have backup fo my iphone.... now how do i synch my iphone with new itunes without loosing my data ?

See if this user-tip for syncing to a new computer helps : https://discussions.apple.com/docs/DOC-3141
If you have music from other sources on your phone (e.g. copied from CDs) and you don't have them on a backup, then there are some program listed half-way down this page which might be able to copy them back : https://discussions.apple.com/docs/DOC-3991

HT4623 how do i sync my iphone with new itunes? I cant find the sync button

how do i sync my iphone with new itunes? I cant find the sync button

The same way you would sync with any other version of iTunes.
Connect the device.
Select the device.
Select Sync.
In the new version of iTunes, the sidebar is disabled by default. With a device connected, it will be listed in the upper right hand corner.
If you want the side bar back, type Cntrl + S.

Usually i back my IPhone with ICloud, after installing IOS 5 it asked me to restore from I Tunes what i have to do?

usually i back my IPhone with ICloud, after installing IOS 5 it asked me to restore from ITunes what i have to do to restore all my contact, applications and others?

If your iPhone does not search for a wi-fi connection before you are asked whether you want to set it up as new phone or restore a backup from iTunes, then I guess you have the same issue as highlighted in this thread:
https://discussions.apple.com/message/19638850?ac_cid=tw123456#19638850
iCloud back ups can only be accessed via wi-fi that's why you are not granted this option, I have the exact same issue.

Hi all, i just updated my iphone 3gs with 5.0 ios version and now i cannot configure the iphone with it because itunes is not recognizing my iphone

hi all, i just updated my iphone 3gs with 5.0 ios version and now i cannot configure the iphone with it because itunes is not recognizing my iphone

Contacts are NOT part of the iTunes backup. If you had read the User Guide when you got your phone, you would have learned that Apple recommends you synch your contacts for safekeeping to your computer (Outlook, Address Book) or a cloud service. Using the phone as your only source of your contacts is foolish as the phone can easily be lost, damaged, stolen, or the data become corrupt.
If you've been using your phone as strongly recommended, your contacts are safe and sound on your computer or cloud service ready to be synched back to your phone. Of course, you should be backing up your computer regularly as well.
If you haven't been doing this, your contacts are likely gone.

I cannot sync my iphone with my computer

I cannot sync my iphone with my computer. The laptop wont even recognise the iphone on itunes. I have had the phone for almost over2 years now. Its a 3GS iPhone. How do I fix this?? I have tried hooking up the iphone to various computers and they also do not catch the iphone on itunes on those computers. What should I do???

If you are using a Windows based computer, try disabling a/v software and turning off the Firewall.
Disable antivirus software
Turn-Windows-Firewall-on-or-off
Then try syncing you iPhone.

How do I back up iPhone with iTunes?

How do I back up iPhone with iTunes? I have the original (1st generation) iPhone.

it should automatically back up the phone once you connect it to your computer

I cannot sync my iphone with my computer. The error message says the ipone sync fails to start,how do I correct this?

I cannot sync my iphone with my computer. The error message says the ipone sync fails to start,how do I correct this?

try a reset on your iphone
make sure you have latest version of itunes
try updating your iphone over wi-fi before connecting to your itunes
reconnect ,try other usb ports
good luck

TS1389 I cannot sync my iPhone with iTunes for Windows. Even if the computer is authorized, it keeps on displaying an error message that tells that this computer is not authorized. I already tried to do the resolutions you have given in case this situatio

I cannot sync my iPhone with iTunes for Windows. Even if the computer is authorized, it keeps on displaying an error message that tells that this computer is not authorized. I already tried to do the resolutions you have given in case this situation happens.

It's an endless circle.
See if these instructions help: iTunes repeatedly prompts to authorize computer to play iTunes Store purchases

Hard drive crashed, how do I set up itunes sync from iphone with new computer?

hard drive crashed, how do I set up itunes sync from iphone with new computer?

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HT1414 why i cannot sync my iphone with my macbook?

why i cannot sync my iphone with my macbook? it is showing a warning not enough space ? why?

Hi, Rakesh Gajera.
Thank you for visiting Apple Support Communities.
Here is an article that you may find helpful with this issue.
iOS: "Not enough free space" alert when trying to sync
http://support.apple.com/kb/ts1503
Cheers,
Jason H.

Is anyone having difficulties installing iTunes Match to iPad/iPhone with new ios7??

Is anyone having difficulties installing iTunes Match to iPad/iPhone with new ios7??

Thanks Diavonex. This is confusing as I enter my account details before resetting it. I folloowed the apple steps: http://support.apple.com/kb/HT5661
http://support.apple.com/kb/HT5661
~yet regardless how much I try, it still opens with "This iPhone is currently linked to an Apple ID *****".

Cannot back up iPhone with new O/S 4.0.2

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