Brick netgear x6 r8000

I have a problem with my netgear x6 r8000 router. For about a month I have not been able to access the classic web page.
The router is detected but I can not get to the login page.
The problem was found when searching for a firmware update. I can even enter safe mode but I can not reflash the firmware.
Can someone help me???
Suggestions???
it is an old router but with open wrt it worked like a charm

ubus call system board

and what is the filename you are trying to flash?

openwrt-23.05.5-bcm53xx-generic-netgear_r8000-squashfs
this file. I actually tried to flash it with openwrt-bcm53xx-generic-netgear_r8000-squashfs
But it doesn't actually flash. do you have any suggestions on this??

Do you currently run OpenWRT?
Is it OpenWRT failsafe mode?
What is in ubus call .... in this case?