CinemaHD 30" not working with high res

Having a strange problem trying to set my MacBook Pro (Retina, 13-inch, Late 2013) to work with Cinema Hd 30" (2008, model A1083) external display someone gave me. I am running BigSur on my MB, I checked all the adapters (Mini DisplayPort to Dual-Link DVI Adapter cable is the right one it seems), but I can't figure out WHY OH WHY I can't get the resolution higher than 1280x800 to show up in the list (trying the option key method). Tried safe mode/resetting NRAM/PRAM etc. The output in 1280x800 is not optimal:(