What do I do for error code 4000 when trying to update my software

Ok, I'm assuming that you are using a Windows PC for the process. Is that correct? If so, and the article I provided you doesn't help, you will need to contact Apple Support directly. To do so, simply select the "Get Support" link in the upper right-hand side of this forum's web page.

See if this post by one of our forum members, Lawrence Finch, can help:

• If you see Error 4000 updating your iPhone with Windows iTunes