Attention: UMTS Stick can be verwenendet only from 3G

I think that there are already plenty of reviews on the configuration and use of the product. On this basis, I had put on me also this device. Mainly I wanted to use the little all-rounder as a 3G router and that's where the problem lies.
I have spent hours on the 3G router and my Vodafone UMTS Stick connect. After identification of the sticks and the following connection attempt me the status of "Unplugged" was returned in the Web menu. Then I flashed the firmware of the router and the stick back and forth to find a working configuration. When I was about to give it up, I started to try again during a business trip and .... it worked. As has informed me of the TP-Link is the cause later in the available bandwidth. Using a UMTS stick only works on 3G (hardware bug)!

TP-Link has responded to me folgenes on the subject:
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Dear XXX,

in the TL-MR3020 and MR3040 the TL-it's not normal that at a "
3G "connection, the device does not connect to the Internet in as
which is a hardware bug. Currently there is no solution
To work around this.

For further questions we will help you.
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Conclusion:
Who does not want to use the 3G router function or will find a 3G connection in all places, is from the TL-MR3020
will not be disappointed. Otherwise, I recommend an alternative.