I'm facing a minor problem with ISP and FLIP. I use an at89c51ed2 mcu with a 20Mhz oscillator in x2 mode. I've found in the datasheet that i should be able to achieve baud rates up to 57600 through rs232 connection, with the given oscillator. The connection to the mcu with flip on 57600 is successful, erasing memory is successful, blank check is successful, but programming fails. It only succeeds at rates 19200 and less. Does anyone have any idea why this happens? I use the auto ISP hardware configuration, as Atmel recommends.