1.04b 918+ no go with your cpu as its to old
most likely for 3617 you used loader 1.03b an d that needs csm/legacy mode (also as boot device)
https://xpenology.com/forum/topic/13333-tutorialreference-6x-loaders-and-platforms/
loader 1.02b and dsm 6.1 is more easy in that area
also you might read faq and tutorial
https://xpenology.com/forum/forum/83-faq-start-here/
https://xpenology.com/forum/topic/7973-tutorial-installmigrate-dsm-52-to-61x-juns-loader/