MAG 254 wifi adapter?

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hi there, I have a mag254 with an wifi adapter, bought at amazon:
https://www.amazon.de/Original-Multi...eywords=mag254

I guess the wifi adapter is a bad one, not sure, I did a speedtest and it was 6mb, thats nothing, my provider should be 50mb, speedtest with smartphone is 48mb, so I bought that usb wifi adapter: http://www.conforama.ch/produkt_2042...1055052__42088 but my mag254 does not recognize it.

do you know why or could you advice a good wifi adapter?

thanks.

[greatest]

noone here with any experience?