I encountered this same issue with the WGR614L, and I don't believe there is any way around using the USB-TTL cable to do a debricking - but that should fix your issue.
Recently i bought a wnr3500l model and put DD-WRT v24(mini) on it which worked fine till last night when a power fail (i wish to believe this) or maybe a succesful break-in attack put the router 'down'. I tried to reset it a couple of times.. nothing new. I mention that the power led stays orange and that wireless won't start and if i try to acces is through lan cable ,dhcp is not working ; the manual tries same thing.
Anybody have any suggestions? (besides the debricking tutorial using serial-to-usb cable which i can't find at this stage) .
Has anyone encountered this behaviour till now?
This is a strange behavior. I never face such problem. If there was a power fail then that might damage power adapter, not the board itself.
Anyway, are you able to debrick it ?
I had the same problem, but I think it was the version of firmware. I noticed that after I made a few changes, it would work until I rebooted the router, and get the solid amber LED, and it would be bricked. I was able to de-brick and flashed down to 14896 and haven't had a problem since.

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