That seems like expected behavior. The fact that it changed to .cur means it actually flashed. It is very hard to brick these, unless you short something while it is powered on.
Where are you with it now? Did you ever get the screen to work with the new skr board? You probably just need to enable the screen in the firmware, or find some firmware that has it already enabled. Are there creality groups somewhere that recommend this board, and might have some preconfigured bin files that work with that screen?
You’re in for an adventure. You can really play around with it. Like I said, they are hard to really break with firmware, so explore. The skills you learn will be very useful for other arduino and Marlin projects.