I can't restore iPhone 7, error 9, how to fix?

Question

iPhone

Hello. Update 10.3.2 arrived, yesterday I clicked on update, popup flew to the main screen. The phone rebooted and the boot loop began - an eternal reboot with a white screen and a black logo. After waiting an hour, I decided to connect to iTunes through a poppy. I connected, said that I needed to restore, I click restore, the firmware is downloaded and the recovery starts, the firmware is extracted, then the phone reboots and a gray strip of the progress bar appears, and in iTunes itself it says "verifying restore with apple ..." and after 30 seconds it throws out error 9.
Googled, tried a bunch of methods - without results. The phone after turning on shows the iTunes icon and wires.
I tried to restore from a MacBook and from two windows laptops. I tried to recover in two modes in the usual dfu and in recovery mode, when you first start rocking down and power. I tried to download firmware from Ipws to a version later than 10.3.1 but the same error.
There is no clear interpretation of error 9 as far as I understand. The cables are definitely working, I tried three pieces. Notebooks too.
The error is exactly every time on "verifying restore with apple ..."
The phone is two weeks old. Didn't fall. The store says it's not under warranty.
Maybe I'm doing something wrong? There was no experience with restoring apple devices.
I would be very grateful for any help.
Ps There is a suspicion that iTunes cannot get a signature for installing the firmware. Tomorrow I will try from another provider and the computer will be restored.