Bridge 4G-AC53U as secondary WAN to RT-AX88U

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New Around Here
Our fibre connection went down at work and in frustration the boss ran away and bought a 4G-AC53U to use as backup.
I have tried everything I could imagine to connect it as a secondary WAN connection on the 88’s first LAN port.
I’ve installed the latest official firmware revision and tested all modes with no success.
I don’t want to have two NAT:ed networks by connecting the 4G router’s LAN to the 88’s WAN (or secondary WAN).
Is there a possibility to bridge the 4G router, or do I have to buy another router ie 4G-AC68U?


Part of the Furniture
Can you turn off NAT, firewall, and DHCP on the 4G router?

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