Michael

Flip the usb C end over 180degrees and try again, also try a different cable.

That's awesome, I wish I had more programming experience. My programming skills are fairly limited. I'm glad someone started this addition to SS, hopefully you can get it ironed out...

> Redundant, ZNP_ROBIN_NANO is exactly same as MKS_ROBIN_NANO The board is a clone of the MKS but it is labeled ZNP on the control board, the redundancy is to avoid...

> MKS Robin (nano) E3 also exist already. Which leaves quiestion: is Neptune X board unique or also rebadge of something else? > > To avoid confusion simple name alias...

Only these from the user guides for the Neptune X and Neptune 3, do you need the Neptune 2 boards also?  

> Neptune X is robin nano 1.3... No the pins don't match anything currently in marlin. 

It's close but not 100% match

> Yep, i see... a bit of a mess. Do you have actual hardware to verify pinouts? Bacause this neptune X v1.0 photo clearly don't match pins. No unfortunately not...

> Neptune X is robin nano 1.3... defines USES_DIAG_JUMPERS and CS pins etc but photo says there are none I copied the nano_v3 and modified the pins since that is...

> Nah, let's leave it as is for now. Maybe someone with hardware will show up to verify. I just noticed that the cs pins interfere with the fsmc pins,...