Unknown error 1645 won't update or sync

my ipod touch will not update the ios or sync because of unknown error 1645.
It keeps freezing up as well so I need to restart it or something...

Did you have modified software installed prior to the update? If yes, this could be a reason for this error. If putting it in recovery mode does not help, the jailbreak damaged your device.
iOS: Recovery mode

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Unknown Error (-48) when I try to sync my iPod

I have started to get an Unknown Error (-48) when I try to sync my iPod to my iTunes music Library, this problem only occurred when I upgraded to iTunes 7 and upgraded to the latest version of the iPod software.
Any suggestions?

At the moment there seems to be no permanent fix for this. This is the workaround I'm currently using until a fix comes along.
Set up iTunes "not" to open when you connect the iPod.
Enable Disk Use on the iPod
Eject the iPod and shut down iTunes
Reconnect the iPod and open Disk Utility
Click on your iPod in the Utility pane and choose Repair Disk which will find and fix a number of errors.
Close Disk Utility and open iTunes and your iPod should connect and update as usual.
Keep the settings above and each time you connect the iPod to update it run Disk Utility repair as above before opening iTunes. It's far from being a acceptable answer but until a permanent one comes along I've found that it works for me. I've tried the Apple advice of erasing the iPod in Disk Utility and restoring it in iTunes but found it only worked for a while before the error came back.

Was updating iPad to iOS 5. Received unknown error during restore. Didn't sync. Appears to be wiped out. Can anyone help? Thanks!

Was updating iPad to iOS 5. Got unknown error during restore. Now it appears to be wiped out. Screen just asks to be plugged into iTunes, which doesn't recognize thx iPad. Have rebooted both. Please help! Thanks.

See if anything on this page helps : http://support.apple.com/kb/ht4097 - it covers update and restore problems

IPod classic 80gb mb1477ll unknown error 53/50 when trying to sync?

So I have a 80gb ipod mb1477ll, and when I try to sync I get a couple hundred songs done and I get a "song title" cannot be be transferred because of an unknown error 53 or sometimes 50. I also sometimes get a "users" ipod failed because disk is not available. After I exit those dialogs it just sits there forever and says finishing sync do not disconnect at the top of iTunes. My wife's ipod 120gb classic same gen, I think works just fine with the same USB port and cable. I've been seeing that I probably need a new HDD for the ipod? What do you guys think? Any help would be greatly appreciated.
I'm running win7
iPod and iTunes are up to date

Hello Reed.jerm,
Thanks for the question, and welcome to Apple Support Communities.
The following article outlines a potential solution to your issue. While the article was originally written for Windows XP, most steps should still apply to your operating system:
iTunes displays -50 error message when syncing iPod on Windows XP
http://support.apple.com/kb/TS1539
For further information, see the following:
'Disk cannot be read from or written to' when syncing iPod or 'Firmware update failure' error when updating or restoring iPod
http://support.apple.com/kb/HT1207
Apple Support Communities: iPod Touch cannot be synced because of…
https://discussions.apple.com/thread/2264793
Thanks,
Matt M.

Why does iTunes say there's an unknown error (-54) when i try to sync my iPhone 5c into my computer?

Everytime I try to sync my iPhone 5c onto my computer there's always a message that pops up and says there's an unknown error. I have synced my iPhone to a new computer and have purchased new music on this computer. I have previous music on my old computer which is still on my phone but i want that music off. I just want to start over with the new music i got on this computer. For some reason, the old music from my old computer won't show up on my new computer, but the old music shows up on my iPhone 5c. I have no idea on how to delete the old songs. My iPhone doesn't give me the option. I'm thinking maybe the error has to do something with that. Any suggestions?

The new iTunes has a somewhat different look from the previous version. You can get the old look back if you prefer it by doing View > Show Sidebar in iTunes. Or you can adapt to the new look.

Unknown error (9) when trying update and restore

My iPhone is now permanently stuck in 'recovery mode.' Retore fails with unknown error (9). Help.

I encountered the same "Unknown" error during my update to 1.1.3.
The iPhone does not have enough free space to perform the update.
For those encountering this error during a sync that is not related to an update, you'll have to check and see if your issue is related to free space.
For me, the solution was:
1) Choose to NOT sync content on the Music, Photos, Podcasts, and Video tabs. Click Apply.
2) The iPhone should sync to a mostly empty state
3) Click the Update button on the Summary tab
4) At the conclusion of the update, re-select content on the Music, Photos, Podcasts, and Video tabs. Click Sync.
-Brian

TS1702 I am getting an unknown error when trying to update or purchase apps from the apps store. This is new, after the new OS update. Help

Hi, I get this unknown error message, twice when trying to update or purchase new apps. It was working fine, then just stopped. I changed my password, but that hasn't worked. Help!

Sign out of your account, restart the iPad and then sign in again.
1. Settings>Store>Apple ID.
2. Tap your ID and sign out.
3. Restart the iPad by holding down on the sleep button until the red slider appears and then slide to shut off.
4. To power up hold the sleep button until the Apple logo appears and let go of the button.
Go back to Settings>Store>Sign in and then try to download again.

Unknown error -3212. I updated to iTunes 11.4. I can no longer connect to the Store.

I updated to iTunes 11.4 when prompted. I can no longer connect to the Store. Tried all troubleshooting, checked Firewall, and my internet connection is fine. I re-downloaded iTunes and selected the "repair" radio button. Still has not resolved "unknown error occurred (-3212)". Does anyone have any other suggestions?

Hey there ILSquid,
It sounds like you have checked your firewall settings, and your internet connection but cannot get to the iTunes Store with your iTunes application and you get this error number 3212. I would look over the troubleshooting in the following article to see what steps have yet to be done. Infact I would recommend doing the troubleshooting sequentially from top to bottom.
Can't connect to the iTunes Store
If you still cannot get to the iTunes Store there is a more advanced troubleshooting article with more to try, here:
iTunes: Advanced iTunes Store troubleshooting
Thank you for using Apple Support Communities.
Take care,
Sterling

I've synced ok till recently but an now having problems syncing myipod touch on windows platform - seems to start ok but then get the error message "an unknown error has occurred 13019" and the sync stops at that point so new music is not added - help!

Hi
I've been able to sync in the past but recently get an unknown error 13019 and the sync is stopped - so new music i've loaded up and other stuff doesn't go across - my ipod classic syncs ok as usual - but my ipod touch has the error.
Please let me have any ideas to fix
thanks
Bill

Have you seen this support article related to your error message?
http://support.apple.com/kb/TS2830
Or see this older thread with a number of other potential solutions.
https://discussions.apple.com/thread/2046768?start=0&tstart=0
B-rock

HT3204 new ipod touch. can access iTunes store. cannot create iTunes ID. get error "could not complete iTunes request. unknown error occured (-1202)".Ipod updated to latest issue,firewall exception allowed.SSL 3.0 & TSL 1.0 ok. Running windows Vista. Help

New ipod touch 32gb. Can access iTune store.Can sample music selection. Completed latest update for ipod Can't make any purchases. Get error "could not complete your iTunes store request. An unknown error occured (-1202)". security SSL 3.0 & TSL 1.0 OK. Firewall enabled for iTunes. ???

laneymenion wrote:
Using Proxy: Yes
HTTP Proxy: 192.168.100.15:80
Change the Using Proxy to No
Have you allowed itunes and itunes helper in your security software firewall?

1st Gen Touch has a pic if usb cable going to a 0itunes logo. It's in recovery mode but keep getting "I Pod" could not be restored. Unknown Error occurred (1). Updated Windows

Entered wrong password to many times, When i started tonight and after i charged my I Pod, It said "Device Disabled" for 6,688,000 mins. in   instructions for Recovery. After Updating Windows & iTunes every time i try to Restore i Pod I get "iPod could not be restored. An unknown error occurred(1)." Tried everything it suggests when I click on "More Information" don't know what else to do...PLEASE SOMEONE HELP THE NOOB

ERROR (1)
- Place the iPod in DFU mode and then restore
How to put iPod touch / iPhone into DFU mode « Karthik's scribblings
- Try on another computer
- Try another cable
- Also, confirm your security software and settings are allowing communication between your device and update servers.
- If still not successful that usually indicates a hardware problem and an appointment at the Genius Bar of an Apple store is in order.
Apple Retail Store - Genius Bar

ITunes 8 Upgrade Results in 5002 unknown Error when trying to update Apps

iTunes 8 reports that I have apps with updates available. When trying to update them I get this error:
We could not complete your iTunes Store Request.
An unknown error occurred (5002).
There was an error in the Itunes Store. Please try again later.

Here is what I did:
Look at the App Store on the phone and see what needs to be updated. Go back to iTunes and delete the Applications (I told it to trash it). Go into the iTunes Store and find the applications you just deleted. "Purchase" them again and it should download the latest version. No, you will not be charged again if you purchased it already. You can probably also do a "Check for Available Downloads" after you delete it instead of going through the purchasing process.
This is just a workaround. I'm not sure if subsequent updates will work or not. It may be that each app needs to be deleted and re-downloaded for updates to work.

Unknown error when trying to update nano

My girlfriend is having an error with her 4gb nano. Whenever she tries to update, she gets the following message: "Attempting to copy to the disk "april's nan" failed. An unknown error occured (-36)." She'll click OK and it'll say update complete, but most fo the songs aren't on the ipod. I tried restarting itunes (she's using the version that came with the nano) and it didn't work. Neither did restarting windows.
Any ideas what could be wrong?

I get the exact same error. Im able to add songs manually at a limited quantity but not in bulk or perform an update. I spent an hour on the phone talking to the Apple guy and I'm sending my ipod back. Let me know if you get it figured out.

Unknown error occurs [-20] when trying to sync purchased songs to ipod

I have purchased 5 songs via itunes store, and they will no sync to my ipod. an 'unknown error [-20]' occurs then, 'and error occurred while writing the devide' then 'the ipod cannot be synced'.
please help!

I was getting the same error -20(cannot write to the ipod unknown error occured)using Windows XP and couldnt transfer song to my ipod touch. I decided to remove my CA anti-virus and installed the free one from avast.com. BINGO my syncing problem went away. Now I can transfer songs to my ipod with no problems. Try removing your anti-virus and see if that helps.

What is 'Unknown Error Occurred (-54)' when trying to sync ringtones

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Unknown error 1645 won't update or sync

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