The following will reset any OpenWRT firmware config mistake (as long as the OpenWRT firmware partition has not been damaged)
First boot without pressing a button and wait until the main LED is no longer blinking.
Then press and keep the physical reset button pressed for around 10 seconds, until the main LED starts blinking.
OpenWRT will now start resetting/formatting the config overlay partition. This takes 2-3min, the LED might turn red meanwhile.
After that it will automatically boot back into plain unconfigured default OpenWRT and you are back in business.
I dont have the device, just trying to advise based on the wiki content:
But you have not modified the boot loader, you need a UART cable. Some basic skills would not hurt either
Use TFTPD64 as DHCP and TFTP server. Copy AX6000 recovery image to tftpd64 folder and remember to set PC's network card ip and mask before running tftpd64.