RT-AC5300_386.12_4 update bricked my router (rescue mode worked)

[mpsharp]

So I was recently plagued by the "kernel: dcd/xxxx: potentially unexpected fatal signal 6" error. Did some searching and saw it was a bug in 12_3. Went through the normal upgrade steps via the HTTP interface which worked great on my RT-AC68U but then I got a suspicious "Please manually reboot" at the end of the RT-AC5300 flash. Sadly it never came back. Tried a hard reset numerous times to no avail. Finally, I tried rescue mode this morning (probably should have gone straight there) using the 12_4 image. Everything is happy again. Guess it was just gremlins in the ether.

 

[L&LD]

When the 'Please reboot manually' message shows. Ignore it. It is disconnected from what the router is actually doing.

Be patient.

Wait for the router to physically reboot.

 

[bennor]

So I was recently plagued by the "kernel: dcd/xxxx: potentially unexpected fatal signal 6" error. Did some searching and saw it was a bug in 12_3. Went through the normal upgrade steps via the HTTP interface which worked great on my RT-AC68U but then I got a suspicious "Please manually reboot" at the end of the RT-AC5300 flash. Sadly it never came back. Tried a hard reset numerous times to no avail. Finally, I tried rescue mode this morning (probably should have gone straight there) using the 12_4 image. Everything is happy again. Guess it was just gremlins in the ether.

Note: There is a specific discussion thread in the Asus-Merlin subforum discussing the 386.12_x firmware:

Release - Asuswrt-Merlin 386.12 is now available for AC models

Dirty Flash! GT-AX11000Pro. So far so good. ... Have you got the correct thread?

www.snbforums.com

If you have issues with that firmware it may help to post direct to that firmware discussion thread.