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Same problem with DWM-157, after two days, it stopped to show its filesystem with installation files. Replaced under warranty but I'm not sure how long it will work.
Try to plug it in different computer; in the case of failure ask for replacement/refund.
Also you should know its behavior:
- while plugging it in usb port it shows content of its "virtual cd" for software installation
- if you install it, run Connection Manager and connect to 3G network then the "virtual cd" disappears, it will look as on your screenshot
- to gain access to its filesystem again, you have to 1. disconnect from 3g, 2. unplug the modem completely, 3. plug it in again.
It is by design, probably to avoid overloading of its internal microcontroller, but switching between two modes looks a little bit unreliable...
Last edited by valihrach; 27 Nov 2016 at 07:04.