I have similar problems as above:
avrdude: stk500_getsync(): not in sync: resp=0x30
avrdude: stk500_disable(): protocol error, expect=0x14, resp=0x51
Tried the suggestions, baudrate settings of my USB port (COM8, so below 10). Tried several baudrate settings (115k, 9600, 19200) to no avail.
ATMega328 (TQFP32 as I built the board myself) -bootloader: ATmegaBOOT_168_atmega328.hex
The LED connected to PIN13 blinks regularly, when starting up rapid blinks (4x).
When uploading, the LEDs on the FTDI chip blink for a short period (communication?)