Rock 4 C+ Dietpi Support?

I have recently bought this board and newbie when it comes to scripting.

I have managed to get the latest Armbian Bookwarm CLI build running ok.

I really want to try DietPi build. However, the RockPi 4 build from Downloads page does not boot at all and no heartbeat flashing blue light. Not getting anything displayed on either of HDMI ports.

I tried to execute DietPi’s create own build from Armbian console but at some stage fails to download packages with error something like unable to resolve dab.debian.org URL.

Reading through the forum, people have varying degree of success to get DietPi running on this 4C+ board. Not sure if I’m missing any trick here to get this running out of the box. Can someone provide step by step guide for a newbie?