Forgetting the password of an iPad 9 with MDM installed

As mentioned in the title, I forgot the password in a device with MDM installed. I did successfully boot into the recovery mode and connect to iTunes in computer.

However, when I tried to restore the device and the device restarted, an error 9 popped up.

I then tried to do it again. This time, error 1100 popped up.

I then tried to use the update function to restore my iPad. Unfortunately, error 75 popped up. I need to use it in a few days and I want to fix it asap.

Is there anything I did wrong or anything I could do to restore the ipad? Or I need to contact the admin to fix it?

Thank you!