I've been communicating with @gloomyandy @PCR and @jay_s_uk on the discord server since I'm using an SKR 1.4 Turbo
They have been patiently working with me until I finally got it working tonight. It was either a hardware problem (incorrect connection of jumper cables from the Pi to the board) or the wrong firmware.bin problem.
These guys are not only top notch for having ported the Duet firmware over to the LPC boards, but they really have donated a significant amount of their time to supporting the end users, being patient with those of us who are a lot less knowledgeable than them.