HUMAX 5400 & SOME OTHERS
Menu- installation-ok-status-ok-STB status-ok then press on the following buttons-RED-GREEN-YELLOW-BLUE-WHITE- then press 0 now ur receiver is 0000
HUMAX F1-C1
Menu - status -STB Status - ok -press UP button at the front panel - i - press the button contain ( ? ) - press yellow button - exit now ur receiver return to 0000