[fatfash]

Thanks everyone who has helped in one way or the other. I was able to resolve the issue of the used steering rack which i was unable to program.
The rack actually wasn't getting 12V from the power distribution box (Z4) located in the engine bay where all the positive terminals are tapped from. Lucky enough for me, the power box has a spare connector with the same size and fuse rating as that of the one to the EPS. I was able to remove the positive terminal to the EPS to the spare connector after which i completed the measures plan with ISTA/P.
Once again thank you all for your help.