Same happened to me, I connected the iPad to iTunes and put into DFU mode, ran the “Update” option (didn’t want to restore if i didn’t have to), and it worked!
If update doesn’t work, I suggest trying the “restore” option that pops up.
Will wipe all data and setup as new iPad, requiring you to enter your Apple ID and password (if applicable) to set it up again.
Instrux for DFU mode:
These instructions work for all iPhone models before iPhone 7 (iPhone 6s and earlier, including 1st-generation iPhone SE), along with all models of iPad (with Home Button) and iPod touch.
# '''Plug in''' your iPad or iPod touch to your Mac or Windows PC.
# Make sure that '''iTunes''' (macOS Mojave) or '''Finder''' (macOS Catalina and later) is running.
# Turn '''Off''' your iPad or iPod touch if it isn't already.
## Press and hold down the '''On/Off''' button for '''3 seconds'''.
## Swipe the '''slide to power off''' slider to the right.
# ''Source: iMore''
# After the device has been turned off, press and hold down the '''On/Off'''button on the top of your device for '''3 seconds'''.
# Press and hold down the '''Home''' button on the front of your device while '''still''' holding down the '''On/Off''' button.
# Keep holding '''both buttons''' down for 10 seconds. (If you see the Apple logo, you've held them too long and will need to start again.)
# Let go of the '''On/Off''' Button but keep holding the '''Home''' button for about 5 seconds. (If you see the "Plug into iTunes" screen, then you've held it too long and will need to start again.)
# If the screen stays black, that's it! Your iPad or iPod touch should now be in DFU mode.
# ''Source: iMore''
At this point, iTunes or Finder should show you an alert saying it has detected your iPad or iPod touch and will allow it to be restored.
'''Reminder:''' If you see any logos on your device, you might be in Recovery Mode, but you're not in DFU mode. If Recovery Mode works, great. If not, try for DFU Mode again.
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