Nokia Asha 503 RM-922 USB ROM Flashing Driver Download Free
If you want to flash or exchanging of files from computer to mobile or mobile to computer your computer will not detecting your mobile automatically and your operating system will not support for your mobile. It means your mobile driver is not installed on your operating system. So your will need to download and install its driver on your operating system. It doesn't depends on your color of operating system you can install it on 32bit or 64bit. After downloading just run setup. When your installation will complete just connect your mobile with your pc through usb data cable and your device will ready for use.
If your computer doesn't detect your mobile after successful installation just restart your computer. You can download latest usb driver from provided link which is given below. After successful installation you will able to flash or connect your mobile with PC via USB data cable.Official site link