Technical datasheets and operational guides for the HG659-12 variant are hosted on the Huawei Support Portal . Huawei HG659 Settings - Simply Broadband
Only do this if your ISP support gives you a .bin file. huawei hg659 firmware update
If you are troubleshooting connectivity issues, checking your current version is the first step: Technical datasheets and operational guides for the HG659-12