Linksys WRT1900AC ver1 mamba

I have repeatedly attempted to install Davidc502 LEDE image/bin files on my 1900AC router and I get nada - Fortunately I am able to get back to the Linksys firmware by turning the router on and off numerous times. I am getting nowhere, and I need to use the WRT1900AC router as a pass-through to my WRT3200ACM router, please help!