Flash oldsboot, twrp recovery or arter (odin AP) then xposed in recovery, then newsboot in odin(choose correct).
For me it works guys. I dont know what is reasons of your problem :/
http://arter97.com/browse/S6/M/root/
Wysłane z mojego SM-G920F przy użyciu Tapatalka
It worked for me. You must turn off auto boot in Odin. Odin old boot, manually force shutdown and then back to download mode, Odin twrp but manually shutdown and restart into recovery. Then you flash xposed etc. Shutdown to download mode and Odin new boot.
Net net. MM needs new boot to start, TWRP needs old boot the manual Shutdown and start into download mode avoids MM trying to start up with old boot in place.
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Thanks guys. I managed to do it with your directions!