I've got the Neptune 3 Pro firmware running on my Neptune 3 :)

[TheFeralEngineer]

Now, I just need to get familiar with DGUS to add the ABL screen. NARUTOfzr, can you help me? ;)

https://www.youtube.com/watch?v=eQO8skgPpu4&feature=youtu.be

edit:
update: I got it to work with the RJ11 cable :D
https://www.youtube.com/watch?v=d89Xlay940w&t=94s

@NARUTOfzr