I did every things.
installing all USB driver.
my phone driver.
ADB driver.
enabling USB debugging.
every thing.
but still i have problem with fastboot commands. like if i type : fastboot devices. it tell me waiting for any device . every thing is work perfectly in adb commands like adb devices, but not fastboot. i also installed SDK and google drivers.
I wanna install a custom recovery (twrp) to back up my EFS folder and then root it and then install custom rom :) . but at the first level i got stuck and i cant install the custom recovery. i can do any command like adb reboot download but in downloading mode i cant use fastboot command as fastboot flash recovery. after typing this fastboot command the next line it tells me that "waiting for any device".