how to fix error "waiting for device" for install twrp in cmd?(GT-I9105)

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HerOoO1

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Jul 26, 2016
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Hi,I want install custom recovery twrp in my device.i install driver on PC,turn on usb debugging,go device in bootloader mod,and my bootloader deafult unlock(because model of my device is old and it's unlock deafult) and my device is ROOT.when i download my last version of twrp and open it with cmd and write "fastboot flash recovery name.img" cmd say "wating for device" and not do anythings at all,and don't go too next stap.what i must to do?(i can open folder of my device on PC)(win 8.1)