Citroen C5 51 plate,correction of milage to BSI and Dash

[Cit Reading]

Hi I wonder if you might be able to help,I work for a Citroen dealer in Reading Uk,we recently had a Citroen C5 in for a speedo not working fault which required a replacement cluster,the milage on original cluster was 39k odd,we strangely enough had a cluster in stock for ait and fitted it,it was found to be faulty(rev counter u/s),so we orderd a replacement,which we fitted,but only when we finished job we realised milage was @ 99k miles,I can only asume the speedo we had, had been returned to our parts faulty,taking the milage from the previous fitting,and then been put back into stock,but as the highest milage registerd on the bsi or inst cluster is used,we now have both bsi and cluster reading 99k miles.
So the long and short of it is I have a customer that wants the milage put back to what it was,but our citroen equipment does not allow us to adjust milage,I have a kwp2000 + kit and some software that came with it,but I cant find what I would use,or infact if I have the correct software,the gumph that came with it mentions I would be able to adjust milage on bsi and digital dash,but does not point me in the correct direction of what software it is,but there seems to be about 50 different types of programs on the disc.
Any help would be greatly appretiated,any any guidence would also be a help.
Many thanks

[Google]

[hcip]

Its a nightmare!!!

you have to spent some money to correct the problem
if you have no tools to correct the mileage

try find some guys that can do the mileage of BSI
or if you have any eeproom reader/programmer
read the BSI eeprom and post dump here and I will
try to help you

some C5 bsi have 912DG128 mcu(2001 to 2003 Made by Sagem)
some are used ST95160 (made by Valeo)

regards