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Blynk.air "not found" error

I want to upgrade my firmware using blynk.air. I have done this once successfully. However, when I upload my binary file an “not found” alert shows up at the top of the screen and upload will not be done.
P.S. I have also incremented the “#define BLYNK_FIRMWARE_VERSION”.

Do you use drag and drop or you’re choosing the file? Could you please show us the browser console output in case of the error?

The problem was resolved by restarting the chrome!