How flash Asus FE380CXG with official firmware

Hi, I've broken the stock lollipop firmware installed on my asus fe380cxg and also the factory reset from droidboot didn't solve my issues. So I've dowloaded the full WW firmware set from asus support website , I would perform a rollback with the UL-K016-WW-4.2.2.0-user.zip file, how can I flash it on the device?

Thanks in advance for your help!