Trying to make my own ROM with BuildOS

[cymonous]

I have a Sprint Mogul HTC 6800. I tried out the Iphone rom recently, but a few things don't work that I really need. I want to make my own rom using the BuildOS. First of all, do I need to first upload a sprint stock rom first?

I build up my list in BuildOS, hit the play button, it gets to the part of uploading the ROM(shows the progress bar both on my phone and PC) and it says it's lost communication with the phone after a bit. One thing I noticed, when the bootloader pops up, it's not 2.40. Could this be the issue also?

I also tried what I think was the "Power, Soft Reset, and Record" buttons, but I am not sure exactly which buttons these are.