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Thank you for your reply, but is this soft-reset? I mean, login to router, go to System -> Backup/flash firmware -> Reset to defaults. It will run this file.
About my problem, i want to use hard-reset, i mean, press and hold the reset button and the router will be restore the default.
I don't know how to modify

It depends on you router model if the reset button is called "reset" and if it is supported.
In any case, the default script requires you to push the button for 5 seconds.

You can also test the reset action manually: just issue the command jffs2reset
and answer y to the confirmation question, and then reboot.
That will wipe your router.