sorry… Not applicable, while flashing the device (and 9600 is a VERY LOW speed to flash - use 115200)… But the COM port… You choose the correct one? And no Serial monitor of any kind is blocking the access?? The Arduino serial monitor disconnects automatically, if I do remember, but others needs manual disconnection…
Other things to check as @PeteKnight has pointed. And the 3.3V… Use power adapter, not the 3.3V output from USB-Serial bridge (Well, I own one that has separate 3.3V 1A LDO, but it is not a common case)