AirPort Express in a bridge mode

I'm connected to ISP with ADSL router which has it's own NAT and DHCP. I had an idea to create WiFi network with AirPort Express (N), but AX's LAN connection never works.
I found a very strange steps that solve the problem:
1. I set AX in a NAT mode. In this mode an option appears that allows to set Ethernet WAN-port speed = 10Mbit/full-duplex. The rest settings are meaningless. Then i save the configuration. After restart the AX is blinking amber with "Dual NAT" error (it's true!)
2. Then I set AX in a bridge mode and save. After restart it lights green and works ok with internet functioning and DHCP from ADSL router working for WiFi clients as well.
But if i power off AX - then after powering on and booting the light is finally changing this way: 1 sec green, 1 sec amber, 1 sec off. And so on. The indicator on the ADSL router is turning on and off synchronously. Repeating steps 1 and 2 does the repair. I've tested it many times.
I have found no other ways to set AX in a bridge mode. The speed 10FD is critical - no other speeds work. Other devices are connected at auto mode and show the speed 100MBit/full duplex. The ADSL modem is ZXDSL 531B (it has internal WiFi, which i do not switch on)

It's not the right behavior. I suspect that your DSL router is a little buggy, because why else are you turning off its radio for a different one? But you could also try exchanging the Apple unit. It makes no sense that the Apple unit only runs in 10 Mbit mode. Have you looked online for firmware updates for both your DSL modem and your AX? That would be the best place to start. Oh, and try a different Ethernet port and a different Ethernet cable.
Good luck!

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