Error -9808
The computer time is wrong, correct it.
Error -9800
Put the exact date, restart the computer. See also here.
Error -5000
There is a problem with the permissions of the "Mobiles Applications" folder. This means that the application you are trying to download from iTunes can not be saved on your pc because the folder does not have write permission.
Error -3252
Connection failure, it may be due to a firewall / antivirus is preventing itunes connect to the Apple server accordingly.
Error -3198
Download failed, try again
"This device can not be read for the requested build"
Error -50
"Error downloading your purchased music. Was an unknown error occurred (-50)". Solution: Delete Storm Video, Quicktime and iTunes and then reinstall iTunes by downloading the latest version. See also here.
Error -43
You have to move up the itunes backup to another place when itunes try back up it will be without problems. If you have windows PC do the following MI> C> USERS> YOUR USERNAME> APP DATA> ROAMING> APPLE COMPUTER> MOBILE SYNC> and then move to another place the backup folder on the desktop or elsewhere. You do the backup again and it will work:
Error -35
This error occurs when downloading songs purchased from the iTunes store. See also here.
Error -1
This error occurs when you are using the "last ditch" method (desperate) to prevent updating the baseband (modem firmware) iPhone 4's baseband not updated when you use this method, you must use TinyUmbrella (you can lose Firmwares iPhone) to remove the iphone from recovery mode, giving you click the "exit recovery" option within the TinyUmbrella.
Error 1
You are trying to downgrade (downgrade) of an iPhone with iOS 5 to iOS 4.X To resolve this, we suggest using a custom firware that you can build with PwnageTool or Sn0wbreeze. See also here.
On the iPhone 4 when you're doing a downgrade iOS 5 using Tinyumbrella option to allow a "baseband update" and skip the error and return to the baseband 4.10.01
It is not possible to downgrade (downgrade). Try to change the USB port (the back are usually better) and restart your computer.
The version of iTunes may also be outdated. Try to update iTunes.
Error 2
ASR does not exist on ramdisk or is corrupt
The customized firmware that can assemble with sn0wbreeze 1.6 has a patch for the problem of ASR. Use sn0wbreeze 1.7 or a later version.
Error 6
The system can not enter the downgrade mode (drop version), change USB port (the back of your computer are usually better) and restart your computer.
Error 9
Since the ASR is being patched (fixed), the SHA signature is automatically changed and after being refirmada the kernel will refuse to use it. Therefore, the kernel needs to be fixed, and if the same kernel is not fixed and patches are not applied, the system can not load the ASR and error 9 appear during the restoration of the device.
Restarting your computer should correct this problem.
Error 10
The LLB (low level bootloader starter or low) is not available in the IPSW file therefore the device can not start. The trick to not update the baseband does not work anymore.
Error 11
The file was removed BBFW an unzipped IPSW. This is used to prevent updating the baseband. The device is bootable if seteas auto-boot to true or use TinyUmbrella to give the button "exit recovery" or "fix recovery".
You are trying to update to a custom firmware created with PwnageTool. Remember that you must put your device in DFU and restore from there.
Error 13
Occurs when trying to install a beta firmware with iTunes for Windows (usually Apple only allows beta firmwares are installed by developers using Mac)
Problem with USB. Check the USB connection and try other direct ports or try to change the cable to the USB connector on the phone.
The version of iTunes may also be outdated. Try to update iTunes.
Error 14
Restoration with customized firmware failed. You have to restore the device with a customized firmware.
Problem with USB. Check the USB connection and try other direct ports or try to change the cable to the USB connector on the phone.
You are trying to update to a beta firmware instead of performing a restore. The dispositvo is still bootable if you remove the recovery mode (using TinyUmbrella)
Restart your Mac or PC should resolve this.
Error 17
The disposito failed to show Apple logo img3 and therefore gives this error.
One or more of the nand0 / nor0 flash pictures have not been found in the IPSW file.
Error 18
This error occurs when the media library on the device is corrupt and can not be modified / updated. Update to the latest version of iTunes and then restore the device should resolve this issue.
Error 20
We have received several reports that this error occurs for several failed attempts to downgrade (iOS 5 beta to 4.3.3). See also here.
Error 21
This error occurs when a restore fails with a customized firmware. You should put your device in DFU mode and NOT in recovery mode. The device does not boot properly and end up stuck at the Apple logo after the error. Press and hold the HOME and POWER until it pressed the reset button.