ASUS XT8 and RT-AXE7800 won't work together in AiMesh setup

[lucaas]

Hi everyone, I have a pair of XT8s running on firmware 3.0.0.4.388_24621 in AiMesh mode. To connect some wired devices, I bought a RT-AXE7800 (firmware 3.0.0.4.388_25058) and tried to use it as the main router and the XT8s will be nodes. The backhaul is wireless.
The router configuration for AXE7800 is no issue. After I successfully added the first XT8 as node, the uplink of XT8 is very unstable and drops out every a few seconds. And it completely disconnected after about 15 minutes. I even put them side by side and still the same.
I also tried the wired backhaul, the drop outs became to every a few minutes and after about 30 minutes it died too.
Are there any compatible issues between the ZenWIFI and RT series routers? Any idea why I can't add XT8 as node to AXE7800?
Thank you.

 

[Tech9]

This is a very strange hardware choice. Your main router has 2.4GHz + 5GHz + 6GHz bands, your nodes have 2.4GHz + split 5GHz bands. Even if this AiMesh was working properly - you can’t have dedicated wireless backhaul plus you have 6E on the main router only. What was the idea?

 

[McKey]

Lol, look whats behind me Share the log from the AXE where it fails and drops, may that shows something. Be careful to hide your sensitive data (MACs, SSID)
(Tech9 dont judge me, i just repaired them)

 

[fokkeG]

My AXE7800 was buggy and died today without any warning.

 

[McKey]

My AXE7800 was buggy and died today without any warning.

In 99% its the MXIC flash.

 

[fokkeG]

In 99% its the MXIC flash.

You mean that’s the part that died?
In the past I’d had a 86u that died. Got the opportunity to buy an other device instead.
Lost confidence in the axe7800, should overthink what to buy next to replace this faulty one

 

[McKey]

If you have a digital multimeter, without disassembling, unplug the 5,5mm 12V jack and in diode mode, measure the center and side pins (12V and GND). If its shorted, that means something just faulty on the power rails. Low chance for that, but it is repairable. If its not shorted, it is very likely the MXIC. Bad thing is that you cant just replace that chip with a new one, at the moment you can only replace it with one from an another AXE7800. But the other AXE probably going to have the same issue with the MXIC...