Hi,
Huawei HG520 and HG530 routers are vulnerable to weak cipher attacks. It is possible to generate the default WEP/WPA key from the MAC address.
The following documents detail the process of developing a key generator for these devices.
English: http://websec.ca/blog/view/mac2wepkey_huawei
EspaΓ±ol: http://websec.mx/blog/ver/mac2wepkey_huawei