ZyXEL VMG1312-B10A Missing Broadband Option and White colour background Screen Issue

Hi everyone,

I just got a ZyXEL VMG1312-B10A from eBay to replace my old HG612. I wanted better firmware support and have heard good things about its VDSL performance. However, when setting it up, I can not find the broadband option under the network settings to set up bridge mode for my X4S R7800. I have tried different firmware versions, factory resets, multiple browsers, and even connected it directly to the phone line, but no luck.

Also, occasionally, I encounter a bright white background screen when accessing settings, which does not help. The device syncs fine, but I can not obtain an IP address since there is no option for DHCP on WAN.

Has anyone faced this white colour background screen issue or missing network options before?