c2d.exe eid_key_file.bin in_flash.bin out_flash.bin [target_id]

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c2d.exe eid_key_file.bin in_flash.bin out_flash.bin [target_id]

....but i have a problem and cant solve it
i got my eid_root_key from 3.55 cfw and also renamed it to "eid_root_key.bin" then i updated my ps3 to 4.21 rebug and used rebug tool v2.01.05 and got my flash of CEX,,,and renamed it to "flashCEX.bin" but when i run command prompt and entered every thing as u did..but in the end when i write 82 nothing happens and when i hit enter it gives me this error "ERROR: input flash file is not valid!" what should i do :/
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