How to use Cummins Allison- JetScan One Pocket (new model)?

The Currency Counter used to has the SD model. I dont know what I press to make the model being inactive.How to active it again? I tried to press the

The Currency Counter used to has the SD model. I don't know what I press to make the model being inactive.

How to active it again? I tried to press the SD button, but it does not turn on

or:The Currency Counter used to has the SD model. I don't know what I press to make the model being inactive.How to active it again? I tried to press the SD button, but it does not turn on

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