The HG658 v2 was widely used by Deutsche Telekom. Their official FTP (now defunct) had backups. Look for files named:
Log into your ISP’s customer portal. Some (e.g., Vodafone Spain, TalkTalk UK) provide firmware downloads under “Support > Router Updates”. huawei hg658 v2 firmware download
: Most modern Huawei gateways are configured to receive "Over-the-Air" (OTA) updates directly from the provider. How to Update Your Access the Web Interface The HG658 v2 was widely used by Deutsche Telekom