Improve checksum calculation
Improve checksum calculation

MarauderXtreme/sipa,lukasjuhrich/sipa,lukasjuhrich/sipa,fgrsnau/sipa,MarauderXtreme/sipa,agdsn/sipa,fgrsnau/sipa,agdsn/sipa,agdsn/sipa,lukasjuhrich/sipa,fgrsnau/sipa,MarauderXtreme/sipa,agdsn/sipa,lukasjuhrich/sipa