Questions about ASUS RT-AX88U Pro AX6000 AiMesh

The existing connections can be seen in the following photo. https://www.alternate.ch/p/o/4/8/ASUS_RT_AX88U_Pro__Router@@1898184_3.jpg

This is a SIM card router, and it can only do 4G, correct? No. You can, for example, operate a mobile phone via USB port and realise a 4G/5G connection via this. Dual WAN is possible (failover and link aggregation). Can it be operated in bridge mode, i.e. as a pure modem? This is possible, but not practical. You are not utilising the great potential of this router. I bought the following 4G/5G gateway to realise Dual Wan with the RT-AX88U: https://teltonika-networks.com/products/gateways/trb500?utm_source=google&utm_medium=cpc&utm_campaign=%7BEU_PRODUCTS%7D&utm_content=159359424939&utm_term=teltonika%20trb500&gad_source=1&gclid=Cj0KCQiApNW6BhD5ARIsACmEbkVjdEKGfa51JAv3OqPVFox5VvapQ0KNXzl1FSs4ltDf6auVz5BnW-kaAlncEALw_wcB The professional Teltonika TRB500 gateway (OS: OpenWrt derivatives) would be very suitable for you. Simply connect it to your ZenWIFI system via RJ45.

I have upgraded from an RT-AC88U to the new RT-AX88U. CFG file is loaded correctly by the new router. However, there are comments in some forums advising against this.

Yes can also be used in repeater mode

For this type of information, it is best to contact the manufacturer's support, which can be reached by telephone https://www.asus.com/ch-de/support/CallUs/.