The only way to unlock it is to go to the dealer and let them put it on the computer to get the code.
There is nothing to reset except the radio presets and the clock.
Depends on the vehicle you're asking about which you did not list.
Anytime a battery cable is removed from the battery the radio will need to have the clock reset and the radio stations re-programmed. (Helpfull)
It seems like your radio is damaged. You can try to reset the system by taking out the battery, if the radio is in your car.
Well remove the radio and there is a master reset on the radio. But if you just remove the positive terminal from the battery it should reset it. And you don't have to remove the radio to do that
will not turn on with code provided after battery change
Not true. The computer does not have to be reset. You can change it yourself. You may have to enter the radio code if it is a theft deterrent radio but you have to do nothing to the computer.
There is nothing to reset except your radio presets and clock. The computer will take care of itself.
go to dealer ask them 4 code pass
There is nothing to reset except the radio. Insert the 5 digit radio code to reset the radio and then reset the clock and presets for stations.
Disconnect battery for about 5 minutes. Then connect it back. Should reset radio.
If you remove the battery or break the connection to it, you have reset it. That is why the presets on the AM/FM radio disappear. The question is how. You do not have to reset anything except the radio presets and the clock.