This one started at the very beginning of the problem: not slow WiFi, not dropouts — there was no network name to tap at all. It was handled entirely over messages and photos, and it turned into two separate faults stacked on top of each other. The first one hid the router. The second one hid the internet.
这个 case 卡在最前面一步：不是 WiFi 慢，也不是掉线——是列表里压根没有可以点的网络名称。全程通过私信和照片线上处理，最后发现是两个故障叠在一起：第一个让路由器“消失”，第二个让网络“不通”。
Two independent problems produced one symptom. The SSID was missing because the router had been used before and left on a custom or hidden network name, so nothing appeared in the list. Separately, the Ethernet cable was in the wrong wall port — UID1, while the provider's activation email specified UID2, so the port light stayed dark and no service reached the router. Fixing only one of them would have left the student still offline.两个互相独立的问题，表现成了同一个症状。搜不到 WiFi 名称，是因为这台路由器之前被人用过，留着自定义或隐藏的网络名称，列表里自然什么都没有。另一方面，网线插在了错误的墙口——UID1，而运营商开通邮件写的是 UID2，所以墙口指示灯一直不亮，服务根本没送到路由器。只修好其中一个，人还是上不了网。
Root cause: two stacked faults. The router had been left on a custom network name so no WiFi appeared in the list, and the Ethernet cable was in wall port UID1 while the provider had assigned the service to UID2, leaving the port light dark. A factory reset restored the SSID, moving the cable to UID2 lit the port, and because this Optus FTTP service obtains its address automatically the connection came up shortly afterwards — all handled remotely.
根因：两个叠在一起的故障。路由器停留在自定义的网络名称上，所以 WiFi 列表里什么都搜不到；同时网线插在墙口 UID1，而运营商把服务分配在 UID2，导致接口指示灯一直不亮。恢复出厂设置让 WiFi 名称回来，网线改到 UID2 后指示灯正常，这条 Optus FTTP 服务本身是自动获取 IP，稍等片刻就自行联网成功——全程线上完成。
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