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Thanks. With a) it seems that the main issue is that customers could reset the panel when the ARC doesn't want them to. b) I suspect exactly the same algorithm is used in the panel as in the program. I think the algorithm was written for whatever 8-bit processor was used in those days. Might as well show the algorithm used, the only bit of it that needs to be secrete is the vector at the top which I have changed. I don't know if you know any programming or python, but it's really simple. # Taken from the data in the exe vector = [3,3,5,5,8,1,3,9,8,0,5,9,3,9,4,1,1,0,9,4,3,0,2,2,8,4,3,2,8,4,9,4,1,3,3,3,3,8,5,3,0,2,4,3,2,1,8,9,0,5,4,3,9,5,8,3,9,9,1,0,0,9,9,3,3,8,2, 1,4,9,1,4,9,2,9,0,9,5,3,9,5,3,3,5,9,1,0,2,9,3,2,1,2,9,8,0,4,9,4,2,3,9,4,0,1,8,5,3,3,9,9,1,0,5,9,3,8,9,4,8,4,2,3,1,0,3,9,4,8,2,0,4,3,3, 1,0,5,2,8,3,3,5,2,8,3,2,9,5,2,1,2,4,4,3,0,4,2,3,4,1,8,2,9,1,0,5,1,8,2,4,3,5,1,0,3,8,5,3,2,1,1,3,9,3,2,3,5,8,3,9,0,3,2,3,5,3,8,4,0,3,9, 1,9,3,0,2,9,3,8,1,4,2,8,4,0,1,9,1,0,1,2,1,3,5,3,3,9,0,2,1,4,1,2,3,4,3,4,9,5,3,5,9,3,1,3,9,4,0,3,2,3,3,4,4,2,1] def generate_reset(quote, version): i = 0 tens = 0 reset = [] while i <= 4 : j = 0 result = 0 while j <= 4: offset = (version + tens + quote[j]) % 256 result = result + vector[offset] tens = tens + 10 j = j + 1 reset.append(result%10) i = i + 1 return reset print(generate_reset(quote = [0,0,0,0,2], version=131)) Notice that there is no multiplication, division, or anything fancy. The % symbol means "modulus" which most people know as "remainder". So "% 256" means "divide by 256 and give me the remainder". You normally get this for free in a microcontroller - an 8-bit number is limited to 256 values, so it just wraps round anyway. Panel firmware would contain it - in fact, now that I know certain panels have it, I can find the long string of characters called "vector" in some of them. The problem with panel firmware is that it is very hard for me to work out what is data and what is code. In x86 exes, there are normally a lot more hints available to me. I can also easily run an x86 exe and step through the running code to see how it works. With a microcontroller in an alarm, I can't easily do this.

I've no idea what your on about. Select, insert and update are all strange words to me. Best pay technistore zillions to do it for me.