In case you are in my situation, with a powered ON non-working Edge Router Lite the option is a console cable.
In my case it was a Friday night when i decided to find a solution without console cable which i simply didn’t had.
You can find lots of video on Internet about opening the router case and you’ll find inside a USB stick, since i had a second ( working router ) i decided to reset it to factory default and clone the USB from good router to the USB of non working router.
The cloning will take some while but the result was …a SUCCESS.
IMPORTANT: PLEASE BE ADVISED THAT ALL INTELECTUAL PROPERTY AND RIGHTS BELONGS TO THE CREATOR OF THIS ROUTERS AND THIS SOFTWARE SHALL NOT BE MODIFIED IN ANY WAY AND SHALL BE USED TO BRING BACK TO LIFE A UNIT THAT DOES NOT BOOT WITHOUT USING THE CONSOLE CABLE ONLY.