Thanks, but 18 hours after last rescue/firmware restore it was still bootloping - the power led comes on, a couple of seconds later the ethernet led comes on then off. Finally the power led goes off and the sequence starts over. The router is totally unresponsive unless I boot it to rescue mode and firmware restore, which looks like it's successful but ends in another bootloop.
Is there anything else I could try?
Have you done a Hard Factory Reset on your AX86U?
ASUS router Hard Factory Reset - Method 2
1. Turn the router off.
2. Press and hold the
"WPS" button and turn the router on.
3. Power light is
on (keep holding the WPS button).
4. Release the
WPS button after the power light is off.
5. Reboot your router by manually pressing the power button.
If the router is truly "bricked" it should enter recovery mode.
To launch the rescue mode and use the Firmware Restoration utility:
1. Unplug the wireless router from the power source.
2. Hold the Reset button at the rear panel and simultaneously replug the wireless router into the power source. Release the Reset button when the Power LED at the front panel flashes slowly, which indicates that the wireless router is in the rescue mode.
3. Set a static IP on your computer and use the following to set up your TCP/IP settings:IP address: 192.168.1.x
Subnet mask: 255.255.255.0
4. From your computer’s desktop, click Start > All Programs > ASUS Utility > Wireless Router > Firmware Restoration.
5. Specify a firmware file, then click Upload
I recommend recovering with stock Asus firmware. With your router the recovery process should take three to four minutes.