Try using a different USB cable or a different USB port (preferably a back port on a desktop PC).
The progress bar will turn yellow or blue and display the flashing progress. Do not disturb, disconnect, or bump the USB cable during this period. samsung gt-c3520 flash file and tool
Here's a more detailed, step-by-step guide to flashing your Samsung GT-C3520: Try using a different USB cable or a
Which are you using to host the tool?
Insert the USB cable while holding the keys and re-insert the battery if necessary to trigger the connection. samsung gt-c3520 flash file and tool
Before starting, ensure you have gathered the following files:




