@Rickyau Go through this FAQ to troubleshoot your issue.

@caidao The number of sites that you could add to the Parental Controls is limited - hardcoded into the router's FW. If you can't add more than 32 websites then you've reached that limit.

@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.