rooted - trying take OTA lollipop dont care about keeping root

i was able to take part one of the update which i think did something to Root....when I open SuperSU it says cant install binary, may need to re-root. I don't want root anymore. I tried second OTA update and fails.

I'm guessing i just have to odin flash a stock img?...my question is, can i do the lollipop one? or do i have to do kitkat and just take the OTA? also, does it matter which version of kitkat or lollipop?

thanks!