iTunes Windows v12.10.9.3 error 4000 for iOS 14

So after many attempts I found something that worked.

I temporarily disabled / removed my passcode to unlock my device, and disabled auto lock. I had to put in my Apple ID password to do so. I didn’t have to disable face id.

hopefully this works for others. Good luck!

after the update it prompted me to create a passcode.

Same here, latest iTunes tested with two iPhone XRs and one iPhone 7 on two different computers.

If passcode is enabled, I get an error 4000 trying to update the IOS.

If I disable the passcode, it works perfectly.

I don't like having to set up my ApplePay cards each time I upgrade, though.

I know over-the-air upgrades are a thing, but I'd like to download it once on my PC and update all my phones with it ... not have each handset spend ages downloading and processing the update file.

So 12.10.10.2 has update the iPad fine, no changes to key code, or anything else needed. It also seemed faster on extracting and backing up. Pain the iTunes update was 2 days late.

itunes 12.10.10 is out

Try it

So. It’s not fixed. The bug is directly to with passcode and Face ID. Works fine if you turn it off. Reactivate your Apple Pay. Sloppy that Apple have not sorted

After dealing with this on my - and my wife's - iPhones (11 and 11 Pro), I performed a "dirty" update to all devices (including my iPad Pro). Disabling the passcode isn't an option for me on my iPhone, since I have a ton tied to it. My wife's literally cannot disable it, due to corporate policy.

For iOS 14.1 on my iPad, I bit the bullet and disabled the passcode (after first forgetting to do so).

Upon requesting the upgrade the second time, it had to "re-backup" the iPad (more of a comparison than a full 100GB re-backup), but it definitely took a long time.

Same issue for me iPad Air3 itunes error 4000 when upgrading to 14.3 using v12.11.026 from Win 10 Pro 20H2, this problem was introduced for me in 14.0

Upgrading a 6s from the same computer using the same cable works fine, cant disable the passcode due to corporate profile on the iPad. OTA upgrade works.

Come on Apple...

It's probably the encryption or something in iTunes related to communicating with the device (I wouldn't go as far as to say "secure enclave", but all of my devices either have Touch ID or Face ID).

The latest version of iTunes (12.9.3 or 12.10.9.3 on Windows) has an issue there.

Also - this update took a reeeeeally long time on "Verifying updated iPad software..." after "waiting for iPad".

I got nervous and nearly restarted my iPad.

Yep. And I’m following the directions. I’m meticulous when it comes to updating my stuff and I always update through iTunes with an encrypted backup. Never had a problem until his iOS 14. I’m still working on his 6 hours later. Apple needs to fix this!

Thanks - this did work for me, bit of hassle re-setting up Apple Pay cards, but worked fine.

Don't know if Apple monitor this, but they need a quick fix. The Error Code 4000 pops up just at the point iTunes would ask you to enter your passcode, so its def related to that.

Most likely another example of Apple launching updates prematurely before testing all bugs! And the severs will be getting hammered.

well done Apple!

no just update :) itunes asks you if you want to restore or just update.

you cannot disable passcode when you have face id ON. your solution is not clear