I see this was published on the web site today, 30th June.
https://www.asus.com/uk/Networking/DSLAC68U/HelpDesk_BIOS/
PLEASE SEE LATER COMMENT, THIS FIRMWARE IS NOT ALWAYS STABLE. BEWARE.
There's no mention in the details about "fixed broken Ethernet ports issue" which caused 3.0.0.4.386.37589...