This usually happens when you hve problems downgrading firmware or jailbreaking.
Here is a guide to fix it.
To fix this error, you will have to make a couple of changes in your
system's "host" file, by pointing it towards Cydia server instead of
Apple's. Also this is not it, you may also receive another error during
restore: 1004, or 1015 from iTunes saying: "The iPhone [you name] iPhone
could not be restored. An unknown error occurred (1004)".
The following step by step instructions will guide you on how to fix
these errors so that you can restore any of your new iOS devices like
iPhone 4 or 3GS to iOS 4.0.1 successfully.
Download the required iOS 4.0.1 ipsw firmware files from here
Put your device into DFU mode (not recovery mode).
- Connect your iPhone to your computer.
- Turn iPhone off.
- Start iTunes.
- Hold Power and Home buttons together for 10 seconds or so.
- Release Power button but keep holding the Home button until your computer recognizes a new USB device.
- iTunes will now recognize your iPhone.
Note: Your iPhone screen at this time should be blank (black in
color), if not, then you are most likely in Recovery Mode, not DFU mode.
Before you proceed, you must make sure that you have your SHSH blobs saved
on Cydia for the firmware version you restoring or downgrading
to. If you don't have your SHSH files
saved, you cannot downgrade or restore to iOS 4.0.1.
So now, what we will do is to trick iTunes into thinking that it is
watching Apple servers, while in real, we are going to change the
address to Saurik's server.
- Navigate to C:\Windows\System32\drivers\etc\ and locate "hosts" file.
Mac OS X users can get to "/etc/" directory by going through "Go -> Go to Folder" from Finder.
- Open this "hosts" file in Notepad (for Windows) or TextEdit (for Mac OS X) and add this
line as shown in the screenshot below:
Now simply save this file and you are good to go!
NOTE for Windows 7 and Vista: Start "Notepad" with Administrator
privileges by right clicking on "Notepad" app, and click on "Run as
NOTE for Mac OS X: Make sure you have full read and write access on
your account when you are saving the host file. If it still throws
permission error, simply copy the host file to desktop, make the
required changes, and then replace it with the original file in "/etc/"
You will now have to restore
to the firmware you downloaded in Step 1. Click on your phone icon from
the sidebar in iTunes. Now press and hold left "alt" (option) button on
Mac (Left "Shift" button on Windows) on the keyboard and then click on
"Restore" (Not "Update" or "Check for Update") button in the iTunes and
then release this button.
This will make iTunes prompt you to select the location for your downloaded firmware file
. Select that ipsw file and click on "Open".
Now sit back and enjoy as iTunes does the
rest for you. This will involve a series of automated steps. Be patient
at this stage and don't do anything silly. Just wait while iTunes
installs firmware on your iPhone
Your iPhone screen at this point will be showing a progress bar
indicating installation progress. Now at some point, iTunes will
probably throw 1004 or 1015 error at you
. This is normal, just ignore this error as the firmware has already been successfully installed on the device.
at this point will be stuck in Recovery Mode, showing that "Connect to
iTunes" screen. To exit your device from Recovery Mode, download this
program called TinyUmbrella (Windows
). Run it and the click on "Kick Device Out of Recovery" button. Your device will now restart normally.
This is it, you should now be able to jailbreak