Magento2 : Reset/Change Magento2 admin password

Solution 1.
Go to phpMyAdmin, select the corresponding database and find admin_user table run the foloing query

UPDATE admin_user SET password = CONCAT(SHA2('xxxxxxxxNewpassword', 256), ':xxxxxxxx:1') WHERE username = ‘adminusername';

Note that each xxxxxxxx sequence should be replaced with any random characters.

Solution 2.
Forgot your password? You can change your forgotten or lost password for the admin account.