@amirgetss

Seems the firmware installed on your N9 is DFL61_HARMATTAN_40.2012.21-3_PR006

And you are trying to flash firmware DFL61_HARMATTAN_40.2012.21-3_PR005

It is not possible to downagrade firmware version once installed.
How the phone know if you try to downgrade?

It look at the PR_00x at the end of the firmware name.

So you'll have to flash a firmware with at least DFL61_HARMATTAN_40.2012.21-3_PR006 in the name and not below.