Problem with uploading LUFA MassStorage .hex file to Leonardo

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i have been trying make leonardo board work usb device. started compiling open source lufa usb library demo "massstorage" leonardo board settings. since i'm using mac os, downloaded "avr tools" software upload hex file board(i didn't want use isp protocol flash. because not possible remove chip board make correct isp circuit connection). anyway managed flash board. afterwards not detectable computer. serial port not detectable. proves flashed something. afterwards flashed again original bootloader file , identified before. i'm beginner arduino programming , forgive me if i'm asking elementary question. doing wrong? can provide me .hex file of massstorage demo leonardo board(only if u have)? because im not sure if compiled file correctly too.



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