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"Calibration Failed

Hi I recently buy a Alesis DM8 in your shop... Now when I switch it on I get an error message saying "Calibration Failed. Try rebooting with drums unplugged or without touching them." Have done both of these but the error message still shows on startup.

Its also and annoying sound in my head phones while the message ins presented.

Help me please

I cant call you I am in Costa Rica
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