@Michael325 You can use a PSU like this to do the job: There are different power rates, according to your needs: https://www.aliexpress<dot>com/item/1005001855183032.html

@Andy_P Yes, it's possible to do that with the OEM firmware. Keep the TL-MR6400 in 3G/4G Router Mode (with SIM card removed). Use this guide to configure TL-MR6400 in AP mode - Case 2. Connection...

@davem7 That's simply not possible:

@Gicbern It appears so from the thread in question. There's a post with suggested action from a TP-Link official as well.

@TN192 Yes, the price is a bit bigger but although your ISP provides 1 Gbps downstream for you, your wired backhaul will communicate at 2.5 Gbps - this means faster transfers in your local network.

@TN192 Yor bottleneck is your switch, which is a gigabit switch. Unless you upgrade to a switch like this one there's no point using the X90's 2.5 Gbps port for the wired backhaul.