Can I upgrade my rooted Asus ZF5 to Android L manually?

I couldn't root my zenfone 5 when it was lollipop . Then I downgraded to 4.4.2 and rooted successfully . When my phone was unrooted I upgraded from kitkat to lollipop by downloading zf5 official lollipop firmware from their website and pasting it into internal storage . Then it updated by itself. But now my phone is rooted kitkat . If I do the same process for upgrading I mean if I paste that lollipop firmware again into internal storage will it be upgraded? I want to upgrade and as well as root . What should I do? Thanks in advance .