Article in English: Unplug from the back of the router the Ethernet cable that's connected to the modem. Skip this step if your router and modem are combined into one unit. You'll usually find this on the back of the router. This button is intentionally difficult to find, so you may have to hunt for it a bit. The "Reset" button is usually a recessed button that's not much larger than the head of a pin. Insert a pin, a bent paperclip, or a similarly thin item into the recessed "Reset" button area and hold it there for a minimum of 30 seconds. This should provide ample time for the router to reset. Your router should now begin turning itself back on. You may have to wait several minutes for this process to complete, and your router may restart itself a few times. You'll do this using the same Ethernet cable that was originally attaching the two. Again, skip this step if your modem and router are one unit. . You'll do this using the stock router network name and password, both of which should be listed on the bottom or back of the router. When first connecting to a router after a reset, you'll typically be asked to enter a new password. Choose something unrelated to the last password that you used to prevent any wireless thieves from reconnecting to your network later.

Summary in Vietnamese:
Ngắt kết nối bộ định tuyến và modem. Tìm nút "Reset" (Thiết lập lại) trên bộ định tuyến. Nhấn giữ nút "Reset". Thả nút "Reset" ra sau 30 giây. Chờ bộ định tuyến khởi động. Cắm bộ định tuyến lại vào modem. Kết nối với Wi-Fi Đổi mật khẩu khi được nhắc.