AX58U V2 3004.388.8_2 to 8_4 not updating

[cseryz]

**Router Model Affected
Ax58u v2

Firmware Version Affected
3004.388.8_2-gnuton1

Is this bug present in upstream Merlin releases too?
No

Describe the bug
firmware update doesnt work to 3004.388.8_4-gnuton1

To Reproduce
Steps to reproduce the behavior:
Manual fw update, or "auto" fw update

Expected behavior
working update

Screenshots
If applicable, add screenshots to help explain your problem or remove this section

After update firmware, router reboots but old version of fw still on place.

[Blarglick]

Having the exact same issue with a TUF-AX5400 V1.

nvram get productid
TUF-AX5400

[shnoah641]

Please use Firmware rescue tool on your routers model page in the drivers and tools and use that utility to install it I had the same issue also follow the rescue instructions https://www.asus.com/us/support/

[Bidonh]

Well, the automatic update from "MerlinAU" utility also failed.
See csv for the details. I pasted only the timely relevant part.

failed GNUton update RTAX58U V2.csv