My HK colleague is using a very old Netgear N300 router (JWNR2000T). So, I decided to help him by giving him a Asus XT8 unit. He is in his 60s and a total computer noob. What I did was to set up the router for him by pairing it with my home modem (Huawei HG8240H5) and creating his home's SSID and password. I then passed the XT8 to him with instructions to simply replace his Netgear with XT8. His modem in HK is Huawei HG863 under Netvigator fibre broadband. I expect it to be a plug and play operation.
However, he reported that the XT8 Led is Red. My question: Can a router that is set up with one modem be able to be used with another modem? If no, it means I must guide him on how to set up the XT8 with his modem using the Asus Router App.