Flash developer ROM over the Stable with Mi Recovery?

This way it's in the right place.

How can I flash the developer ROM over the Stable one with a Mi Recovery and with Native Root? (No costum recovery and SuperSU)

All the guides I saw use custom recovery. Can I just change the name of the .zip to "update.zip" and choose update?

By the way, is there a mirror to download the official ROM, I can´t complete the download from the official site...

Thanks