[SELF-SOLVED]What is the usage of Segher's zestig?

Hi!
What is the usage of Segher's zestig?
I tried running like this:

./zestig nand.bin unpack

Is this right?
It says:

bash: ./zestig: cannot execute binary file: Exec format error

so I guess not.
Thanks,
hugofestA

Edit: nand.bin is not the nand.bin + keys.bin merged file.



Edited 5 time(s). Last edit at 02/07/2016 04:41PM by hugofestA.

It was an issue, because I was not using Linux.
I have a new error.