Can't log in after flashing firmware [SOLVED]

Here's the situation as it happened to me. I got a new router, and flashed OpenWrt over the manufacturer's factory firmware.

I connected to the login page ( and tried to log in. But the web GUI simply goes back to the login page, as if my password were incorrect.

There's a longer description of what's happening in Github, (tl;dr - it's most likely a cookie problem), BUT...

The solution is to clear cookies for the router address (likely and then refresh the login page. It should work.

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