1. A method of generating a delta file, the delta file including update instructions for causing a target processing device to transform a current memory image module into an updated memory image module; the method comprising: incorporating a parametric representation of a first memory address in the delta file, the parametric representation being parametric with respect to at least the location of the current memory image module in memory space and the location of the updated memory image module in memory space; and incorporating parameter resolution instructions in the delta file.