Yesterday i bought an xbox360, opened it up and prepared for flashing with iprep as in the tutorials i've read.
I put the files i needed on a usb stick, and used iprep. The stupid mistake on my part is that i pressed "press any key" at the end of the process before turning on the power of the 360

And then it stucks....when i rebooted, iprep says my firmware already exists and i cannot continue..
Please, can somebody help me with how i can still fix this and flash the right firmware on?
It's much appreciated!