Users in the Apple environment have access to a tremendous selection of useful sync and restore features for their devices. Uploading their data on the cloud storage, creating automatic backups from a Mac computer, or restoring their device's software through iTunes are all too convenient options to have. Unfortunately, as with most software products, errors could prevent the user from accessing these features. One such error is 'There was a problem downloading the software for the iPhone "iPhone." An unknown error occurred 9006.' Usually, this error appears when iTunes has encountered a problem and is unable to connect to the iOS software update servers. The reasons for this failure can be varied, ranging from temporary server outage to weak internet connection on the user's side.
Luckily, the 'iTunes Error 9006' doesn't represent a major issue with the program, and there can be several relatively easy fixes that could be able to deal with it. Affected users should first check to see if there are any new iTunes updates available. Newer update patches oftentimes address issues present in the older product versions. To see if such updates are out, launch the App Store and select the Updates tab. You also can open the Help tab, scroll down and click on Check for updates. Sometimes the 'iTunes Error 9006' can be caused due to restrictions imposed on the current user account that could prevent connections to external servers. To make sure this is not the case, make sure that you are signed in with your administrator account.
The connection to the iOS update servers also could be stopped by any anti-malware products present on the user's computer. To test if this is the cause for the 'iTunes Error 9006,' disable all anti-malware solutions you have installed temporarily and try to run the faulty iTunes operation once again.