How to change password / passcode on a Verifone T650p terminal (mx51)

Press the hamburger menu on the top left corner

Select Terminal Setting

Enter the Manager passcode and press Enter

If you don't know the Manager passcode, you can click the three dots on the top right and entering the Daily Admin Passcode

Select Change passcode

Select either Manager or Cashier to update the passcode

Enter a new 6-digit passcode and press Enter. Note that the terminal will ask the user to re-enter the new passcode to confirm.