The HG658 v2 was rarely sold unlocked. Most units are ISP-branded (e.g., TalkTalk Wi-Fi Hub, Plusnet Hub One). ISPs customize firmware to add their TR-069 remote management, custom SSIDs, and VoIP settings.
: If possible, perform manual updates using an Ethernet cable rather than Wi-Fi to prevent connection drops during the file transfer. huawei+hg658+v2+firmware+download+updated
This means that the router you have likely came from an Internet Service Provider (ISP) like Vodafone, Movistar, or TalkTalk. These ISPs customize the firmware to work specifically with their network settings. The HG658 v2 was rarely sold unlocked