Cannot type anything other than numbers on lock screen of remotely locked device

You wouldn't think this would be possible, but I used Android Device Manager to remotely lock my kid's tablet, and I used a password that includes upper and lower case letters and an underscore. Trouble is, I cannot unlock the device because it only allows you to type numbers on the lock screen.

I tried to remotely change the password, but I can't connect to it remotely anymore! I don't know why. It's powered on, but apparently doesn't want to connect to my Wi-Fi anymore.

Do I really have to flatten the device now?

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