How to flash a backup radio.img?

hi everyone i was trying to test a radio and i installed one radio that didnt work i already make a backup of my radio using this:

Quote:

adb shell su dd if=/dev/block/mmcblk0p20 of=/sdcard/radio.img exit

and got the radio.img

now when im trying to flash the backup i made using this...

Quote:

adb shell su dd if=/storage/sdcard0/radio.img of=/dev/block/mmcblk0p20 exit

i got this... (dd: /storage/sdcard0/radio.img: No such file or directory)

how can i flash my radio.img... HELP :confused:

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