[nickant]

Help!
We have the occasional power outage here - usually only lasts for a second.
One early this morning was quite short - short enough the PC's on standby stayed in standby.
However, while my Linksys EA8500 came back up ok, the WRT1900ACv1 is active but I can no longer access it via its GUI - either from the other side of the house (EA8500 connection) or a PC connected directly to it.
I've tried restarting everything, but no luck.
It's still working, except that it seems to have lost 5GHz wifi - 2.4GHz is fine.
Any ideas as to how to fix it?
Will I have to reset it to DD-WRT defaults and restore settings?
Cheers

[blkt]

Can you Telnet or SSH into it?

There are intermittent startup problems recently, so you may have better luck after a few more cold boots.

Worst case scenario you can use the triple power cycle method to return to the previous firmware on the other partition.

[nickant]

I usually disable Telnet and SSH for security.
I tried the triple reboot - success!
Updated from r42460 to r42514 - went well.
Now 5GHz is back up again, too.
I remember last month, the EA8500 went to the previous build after a power failure.
Thanks for helping!