The need to enter the code could be because of a brief loss of power to the unit, this could even be due to jump starting/ low battery power while starting or bad battery earth connection!
The err message is because you entered the wrong code more than once.......to get back to the screen to enter the correct code you will have to leave the power to the unit on for anything from half an hour to a few hours! But you will need to make sure you have the correct security code or you will block the radio and it can only be unlocked by an audio specialist and will probably cost more than the unit itself.
You can get the correct code for a small fee by contacting this link: Car radio codes in Uxbridge London Gumtree
SOURCE: Have Blaupunkt Cd changer attached
turn it on after turning on the motor ...and press the AS(or turn on cd player pressing this button on ) and hold to enter the code..or ..if you are already at that part the trick is that it has only 4 number buttons ..so each button is assigned to one digit in the code..
ex for the first digit ..press the number one as many times as the digit is ..
to type 2468 for example press no 1 for 2 times..the no 2 for 4 times ..and so on ..
each time you press a position it will be the number needed in that position ...
I hope I didnt made a mess with your senses....
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