64gb card bricks Camera after making bootable

[kway831]

So i was able to get ML onto my Canon T3i using a 1gb card I have and now iv been trying to make my 64gb card bootable to use with ML. So when i first used MacBoot i was getting the "permission refused" message that is supposed to happen with Mountain Lion (10. and Mavericks (10.9) but my MacBook Pro is running OSX Yosemite. any way i was successfully able to make the card bootable after using the zip file but now when i put the SD card into my camera the camera will not turn on until i take the batteries out and put them back in, the red light for the SD card dose flash when its put in though. what am i doing wrong?

[Walter Schulz]

Delete autoexec.bin and ML directory and *.FIR from card. Copy extracted nightly build contents to card.