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Contact GSM-9M. Quick start guide.
Install the software
Unzip archive Drivers, and Install the downloaded Driver
(Drivers\CP210x_VCP\CP210x_VCPInstaller_x64 or Drivers\
CP210x_VCP\CP210x_VCPInstaller_x32), depending on the
version of your operating system:
• Accept the agreement, click “Next”.
• Click “Finish”.