How do you reset a blocked radio for opel corsa?

To reset a blocked radio in an Opel Corsa, first, turn on the ignition without starting the engine. Then, press and hold the "AS" button (or the button labeled "RDS" on some models) while turning on the radio. Keep holding the button until the radio displays a message indicating it is unlocked. If this doesn't work, you may need to enter a security code, which can typically be found in your owner's manual or obtained from a dealership.