Flash DD-WRT firmware on a Netgear R6400v2 router

I need assistance with flashing my Netgear R6400v2 router with DD-WRT firmware. I do not currently have DD-WRT firmware installed on my router. I need help obtaining the correct firmware and instructions for my router and for someone to flash the router via remote logon.

Ideal Skills and Experience:
- Experience with flashing routers with DD-WRT firmware
- Knowledge of Netgear R6400v2 router
- Ability to remotely logon and install firmware on the router

Preferred Method:
- Remote logon and installation of firmware on the router