You can use the stock file on a Corona, but that would technically be RGH2, not S-RGH. If you only have a matrix, then yes, try the stock file, without programming the ACE.Is it necessary to program the acev3 to do s-rgh? I guess the timings need to be different?. I've read that it comes ready for corona. I have a slim-e with a v5. I only have a matrix nand programmer, guess I could modify it. Been using lpt for cool runners. I only mod when I find a cheap system, for kicks.