A Hard Reset will remove all data and reload the Operating System clean and with no password. The Reset is done with the tablet turned off, so you don't need a password to do it.
Turn off the device. Press and hold the Volume Up and Power keys. When the Alcatel logo displays, release both keys. Use the Volume Up/Down keys to navigate to wipe data/factory reset.
Videos as well
https://www.google.com/search?q=alcatel+a30+tablet+hard+reset
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