iPad Pro 2nd generation won’t update from 15.0. to the .1 or .2 updates. What do I do to troubleshoot this?

Hello TC_2021, 

It sounds as though you’re having issues updating iPadOS on your iPad Pro (2nd generation). Apple Support Communities is a wonderful place for help! 

As you’ve seen in the related article iOS 15 and iPadOS 15 are compatible with these devices, your iPad is compatible with the latest iPadOS 15 versions. If you’re having issues updating you try the steps outlined in the following article. 

If your iPhone, iPad, or iPod touch won’t update

If you continue to have issues after those steps please let us know, along with a detailed explanation of what’s happening when trying to update. 

We look forward to your response!

Borrowed an active SIM Card and the update went smooth. What a waste of time!

Thank you!! That worked for me too!!

Older-Wiser-ish wrote:

Thank you, I took the SIM card tray out and it went straight into update installation. No problems :-)

It’s good to hear that the workaround continues to resolve the problem.

I am having the same issue and have done everything as well and will not update. When I tried from the computer I keep getting "The iPad Pro (12.9) (2nd generation) could not be updated. An Unknown error occurred (4000)"

I have completely wiped the iPad and still no go.

TC_2021 wrote:

iPad Pro 2nd generation won’t update from 15.0. to the .1 or .2 updates. What do I do to troubleshoot this?

There are issues with update of some iPad models to iPadOS 15.0.1/15.0.2.

For affected WiFi+Cellular models of iPad, such as yours, many are reporting that removal of the SIM tray from the iPad will allow the verification and installation process to compete. Other reports suggest that installing a SIM card (whether actove or not) also permits the update process to complete.

You may need to restart the update process, but removing the SIM tray from the iPad is simple and costs nothing to try.

Remove or switch the SIM card in your iPhone - Apple Support

Looking for addtitional help.

1. from Ipad - hangs up at the verification phase with the notification that it can not verify -- have tried 2 different networks with same result. Both times deleting updates for a redownload.
2. From computer and Itunes -- runs smooth but get the (4000) error. Alos tried from 2 networks.
3. Ipad - does not have a sim card. but did remove the holder
4. REset ipad and the above did not work.

Suggestion?

All have not worked

Thanks! That worked!

I used an inactive SIM Card.

Having successfully employed my recommendation, I suggest that you now update to the [now] current version - iPadOS 15.1. You shouldn’t have the same issue with this update.

Thanks! That worked for me too!

Thank you, I took the SIM card tray out and it went straight into update installation. No problems :-)