There are several reasons for this.
1, the bridge of the superior router itself can not connect to the network, resulting in the use of the bridge function of the router can not be used normally;
2. The Settings of the bridge upper router limit the networking function of the device connected to the router, resulting in the router cannot be connected to the network and cannot be used normally;
3, the network operator's line failure caused the router can not connect to the network can not be used normally!