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I have an iPhone on which I can't log in anymore. Too many failed passcode attempts. Now I want to wipe it with iTunes on my MacBook Pro. But iTunes is failing with

There was a problem downloading the software for the iPhone "iPhone". An unknown error occurred (1671).

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I have the latest iTunes.

What can I try next except for heading to a phone shop?

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From this Apple support article:

If you see error 1671, iTunes is downloading necessary software. Wait for the download to finish and try again. To see how long the download should take, you can click the down arrow in the upper-right corner of iTunes.

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If you have a poor connection for whatever reason & the download keeps failing, then you can separate the two tasks, Download from Restore, by manually fetching the ipsw file from Apple's servers.

The links are all maintained on https://ipsw.me/signed - the actual files come directly from Apple & so are safe to download, the site merely lists the direct download locations.

If you are uncertain as to the correct file to download, then check the name against your previous ipsw file, which iTunes should have stored at
~/Library/iTunes/iPhone Software Updates/
with a file name, for example of iPhone8,1_9.3.2_13F69_Restore.ipsw
...then you look for the v9.3.2 of that particular device on ipsw.me [assuming your device is new enough to support iOS 9]

You then copy your new ipsw file to the same location as your old one, erase the old & go for the restore again. It will find the correct file & work from that.

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