At first you need tuning software:
https://www.tunerpro.net/downloadApp.htm
then you need „ecu driver“, for P8 cossie ecu is here:
http://www.cosworth.sk/data/_newP8_V21_2_5BAR_CL1_v1_3.rar
OEM Binary files for IAW 048-P8:
http://www.cosworth.sk/data/TX14-16based_diagOK.bin
http://www.cosworth.sk/data/TX11-12.bin
personally I prefer to use TX14-16 software, its new version. TX11-11 had some bugs during „live tuning“. Both software are same in fact of engine runing…
Remember those files are for OEM engine setup: Small blue injectors, T34 turbo, 2.5Bar MAP sensor.
All IAW P8 ECUS are using 27C256 chips with 32kb memory