SBG6580 Brick

Hi folks,
My first post..

I have a brick SBG6580, flash writer and TTL console... and hands.
A few questions:
Is there a good firmware I can use to flash it back to life?
Is there a modded firmware with drivers and busybox so I can use it as a bad router?
Is there anything else interesting to do with it?

I also have SBG6782AC which came to replace this one but it is as bad wireless and router as this one so I ran it as a modem only... Is there anything interesting for it too? :-)

Thanks for reading...

BR