Good, that it did not work, because effectively that makes your phone look like a jailbreak. Then iTunes will not download the update.
I posted the wrong video, sorry.
Now you have to make some "repair":
1. uninstall TinyUmbrella, delete the downloaded TinyUmbrella file and the others you downloaded (if any), empty the Trash.
2. In Finder GO menu GoTo folder /private/etc/
locate the hosts file (it just says "hosts" no extension)
copy this file to the desktop
3. On the desktop open the file "hosts" with Textedit, then you will see a number of lines with the # sign before it and some lines that haven't. Delete all lines without the # but for these:
127.0.0.1 localhost
255.255.255.255 broadcasthost
::1 localhost
fe80::1%lo0 localhost
leave all lines with #
after this there are only the # lines and the 4 lines above
close textedit saving the file.
Leave it on the desktop and copy it to the original in /private/etc/
it asks for your password, then restart the computer.
iTunes will now be free again to download the update for your iPhone.
I think that the download was corrupted (it is a large file, about 1.2GB, you need a a good internet connection). So if you want to try again, you have to delete the .ipsw file in
˜/Library/iTunes/iPhoneSoftwareUpdates/
Then iTunes has to redownload the file again, connect the iPhone with the cable and uncheck sync with WiFi.