Hi mehdi yazdi,
i'm not sure what you want do do...
If you format your SD card (with a card reader or in the camera), all the files on it are deleted, after that the card works in your camera "normal" like any other SD card.
CHDK never changes the original firmware of your camera, it's not a "real" firmware update, only additional features while you have the CHDK files on your card & started CHDK (with the "firmware update" menu item or by Autoload with a prepared, locked card).
The firmware screen with informations like
Firmware Ver GM1.01A
May 29 2007 18:17:20
will be shown only when there's a file named ver.req on the sd card (in the root folder), you start your camera in play mode an then press FUNC SET + DISP...
...have a look to the CHDK wikia: CHDK for Dummies
And please NO double posts !