@Luxianos Go through this FAQ and check all the options that may affect your wireless adapter speed.

@lito69 FW region is usually marked with two capital letters like this: In your case it should be (EU). The problem you're describing is because this router model is listed as an ISP customized...

@lito69 You can determine its FW region and HW version on the bottom sticker - details. The problem is that I couldn't find any FW to download for this model except on Brazilian portal. If the FW...

@lito69 Has this router been provided to you by your ISP ? If so, then you should contact them regarding FW upgrades.

@IRaeen When powered on press the reset button for about 10 seconds to reset the router. If that doesn't work for you can contact your local support for further assistance.

@Andre_BR It's basically an option that can be used if you are having trouble getting a DHCP address from your ISP. if you have it unchecked and are getting an address from your ISP you can leave it...