IOS 18.7.7 for iPad 7th Gen not working

I have a 7th gen iPad. I didn't bother updating it, because it was out of space - it's currently running 18.7.1.

I'm going to get a new one, so I did a factory reset to create space and update to 18.7.7.

I'm not sure whether this is related to the version if 18.7.7 22H330 and 22H340, but I'm completely unable to update it. I've tried 2 ways - using the iPad itself and also via my Macbook. I've checked and my Macbook OS is up-to-date (It's a 2 week old Pro M4 Pro).

Error on the Macbook is:

The iPad “[MY] iPad” could not be updated. Declined to authorize this image on this device for this user.

Error on the iPad is "Unable to Verify Update"

So I had a look at the version downloaded and it's iPad_10.2_18.7.7_22H340_Restore.ipsw, which is the wrong version. 22H340 doesn't support 7th gen. Only 22H330.

Any ideas?