The BIOS might be trying to access the EC without synchronizing with the operating system in Bug reports Posted June 17, 2016 · Report reply Hi! I have this motherboard Asus Maximus VIII Hero Aida64 5.70.3800 cases this error with these settings. If I turn off AIDA64 error goes away. : The embedded controller (EC) returned data when none was requested. The BIOS might be trying to access the EC without synchronizing with the operating system. This data will be ignored. No further action is necessary; however, you should check with your computer manufacturer for an upgraded BIOS.