Before searching for a "phoenix usb pro 4pda link," check your device's chipset. Phoenix USB Pro works with:
Click on the button at the top left of the interface. Browse and select the key.txt file found in your installation folder. (Without this key, the software will not authorize the flashing process). phoenix usb pro 4pda link
The device must be completely powered off before connecting it to the computer. To force the Allwinner chip into flashing mode: Before searching for a "phoenix usb pro 4pda