To make your ADL-528 region free (appears to work on the CH302 as well)

Press Open/close so tray is out

Press stop

Press 1 9 9 9 (you will see no response while pressing each button)

Press Enter if menu hasn't already appeared

You have now entered the hidden system menu

If not on the Region Code window use the up/down arrows to get there

Press enter and now press up/down to select ALL

Press Enter again

Press setup to exit and open/close to close drawer

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Alternative Version of this with no disc in drawer and drawer closed press

stop 1 9 9 9

does the same thing