You can still resort to iCloud "Find My iPhone" feature to reset your iPad. Follow below steps.
If Find My iPhone app is on, you can try the socond method: Reset iPhone password with iCloud Find My iPhone. The detailed steps are shown as below.
Step 1. Go to
icloud.com and log in with your Apple ID and password on your computer.
Step 2. Click Find My iPhone. Then click All Devices at the top of your browser window.
Step 3. Select your iPhone from all the devices listed. Click Erase iPhone to erase your iPhone along with its passcode.
Step 4. Use the Setup Assistant on your device to restore the most recent backup of your device.
After the restoration process is finished, your passcode will be erased and all your data will be restored from your iCloud backup.
For more details, check:
How to Reset iPhone Password with iCloud Find My iPhone
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