"EFI and Firmware update from 4,1 to 5,1 for Sierra Upgrade Solved"に関する回答Just updated from 4.1 to 5.1. Had already disabled sip. Copied expanded MacPro2009-2010FirmwareTool.zip from http://forum.netkas.org/index.php?action... to desktop and ran Mac Pro 2009-2010 Firmware Tool.app. Got error 5570. Downloaded MacProEFIUpdate.dmg from https://support.apple.com/kb/DL1321?loca... to desktop and ran again with success.