ViewSonic VS15197 Service Manual page 118

5. Install USB Serial Port driver
(The same process as step 4.)
USB Serial Port
‐> Update Driver Software
‐> Browse
‐> Let me pick a list of device drivers on my computer
‐> Show All Devices
‐> Have Disk
‐> Browse
‐> \Mstar\Cdm20808 ‐> OK
‐> Next
‐> Install
‐> Close
(After the driver has been installed)
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VSD241/SD-A245/CDS245