Look at the front of your activa key shutter. If it has an unlock button and a latch, then it can be opened without a key.
Look carefully on the very outside front of your shutter and find the unlock button. Push it with a pen or a similar object.
Look for the latch on your shutter. If you can't find it, try searching for it in a clear view of the shutter. Pull the latch with your fingers to open the shutter.
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