Hi,
You dont need to take dash out have recently changed the matrix on my S1.
Check out this thread from seriesoneforum.
http://www.seriesoneturbo.co.uk/showthread.php?t=13891
(you'll have to be a member tho)
I did a step by step guide look at the bottom of the thread.
Hope it helps, If not PM me and i'll give you my mob number and i'll try to talk you thur it.
I'll even try to copy over the thread now for you.
cheeRS
Barney