That is "heartbeat" behavior. Put some load to it and you will notice the blinking gets faster
Can also be adjusted via "trigger" files in /sys. Do something noob'ish like "du -a /sys|grep led|grep trigger" and you will find them.
Congrats, you have been scammed. H3 can handle 2GB of memory at most. Also max resolution is 4K30.
https://linux-sunxi.org/images/4/4b/Allwinner_H3_Datasheet_V1.2.pdf
Start with bumping to the latest release and kernel. We cannot support any older releases besides current one.
Also check powering and wiring. Sometimes voltage slightly above 5v is handy to compensate loss due to wires and contact resistance.
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Armbian does not support this board. Any image you may find in the web were created by a 3rd party. Therefore ask wherever you got the image from. We cannot help.