Opel Astra 1.3 Cdti 2007 With Kess Clone

[Carletto78 10]

I read successful a Opel Astra 1.3 CDTI 90cv year 2007 with a clone of kess 4.0.36 by OBD port

 

Now i have mod the original file for EGR OFF and increase power but i not correct the checksum.
Is secure upload this file whit kess or i block the ecu?
Kess correct in auto the checksum?

 

Thanks...