IPad won't update to 4.2.1

[cokecan]

Hiya,

I have an iPad which currently has 4.2.0GM (build: 8C134) I am not a developer but my brother is and he installed the GM on my iPad on his account.

Now that 4.2.1 is released I have tried to update but iTunes just says that the current software is the most recent. I have tried to restore the iPad in the hope it goes back to a previous version but iTunes says "the resource *iPad name* cannot be located" even though the iPad shows in iTunes as a connected device.

I'm guessing that my iPad is in someway linked to my brothers account and is for some reason stopping me upgrading?

I have tried downloading the new file from apple direct and clicking shift update but the file is not extracting as an ipsw (I have windows 7 - sorry!)

Any advice please?

 

[koopa35]

im having same issue

 

[Redneck1089]

Also am having the same problem.

 

[Saberon]

Wirelessly posted (Mozilla/5.0 (iPad; U; CPU OS 4_2_1 like Mac OS X; en-us) AppleWebKit/533.17.9 (KHTML, like Gecko) Version/5.0.2 Mobile/8C148 Safari/6533.18.5)

You must shift click restore to update to 4.2.1 from a beta or gm. Try downloading 4.2.1 using firefox instead of Internet explorer. Sometimes ie does weird things. You could also try Downloading with google chrome. I have windows 7 and updated from gm to 4.2.1 doing the shift restore method. I always get my iOS firmware from here

http://www.felixbruns.de/iPod/firmware/

 

[Night Spring]

A common reason why ipsw files don't work is that the extension gets changed to zip when downloading. First thing you do when you download an ipsw file, check the extension, and if it's zip just change it to ipsw.

 

[cokecan]

I managed to get it going in the end by following the details in this thread: https://forums.macrumors.com/showthread.php?p=11474259#post11474259

Basically a restore did the trick, although I did have to restore to a point which was before the GM install.

For the other posters, I did eventually get the file unpacked but iTunes was asking for a password to extract when I attempted the manual upgrade.