@do0zer you might want to read through this thread https://community.tp-link.com/en/business/forum/topic/622852?sortDir=ASC&page=1 in particular this Upgrading the old version of firmware to the...

@Andre_88 Does your USB modem get a true public IP address ? or does your mobile network use CGNAT ? If its the latter , then you'll not be able to connect

@acedilloruss My guess is that you have ISP supplied modem/routers in front of the ER605 which use NAT and are supplying private addresses to the ER605 via dhcp. You need to talk to your isp to see...

@acolmenares84 see page 18 of the user guide here https://static.tp-link.com/upload/manual/2022/202208/20220830/1910013241_ER605(UN)2.0_UG.pdf

@acedilloruss from that screeshot it looks like both WAN connections are being allocated the same IP 192.168.254.100. I'm confused by the fact that 192.168.254.100 is NOT a public routable IP...

@Sofortune login to the router gui , go to Network->LAN then click the 'edit' icon for the default LAN Change the IP address to 192.168.1.1 , change the DHCP pool Starting and End addresses to be in...