I am also having the exact same problem. Get blue then slow green flash and still have efi locked. Have tried multiple times and same outcome. mid-2015 15" mbp A1398 EMC2909
after unlock hit the power button and then hold down alt+option+r key +p key all four keys down and let it chime twice after the second chime you should be good to go and holding down option to boot to your media.. erase drive reload os and setup new icloud account
That still does not work. I never got the second chime and it goes right back to the locked efi screen. I ordered a raspberry pi and was able to rewrite the efi file and it worked! Im just bummed I wasted $200 on something that said it would work when I could have gotten away with a $40 pi and the $30 ezflash adapter
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