MSP430FR2433: No any ACK from MSP430 BSL

Part Number:MSP430FR2433

Hi,

I'm doing UART BSL function on my Host side, but when i sent BSL Command, nothing feedback from MSP430.

I'm sure below:

1. the BSL entry signal is exactly following the description in SLAU550J.

2. My host's UART TX connect to MSP430FR2433's P1.5 and Host's RX connect to MSP430's P1.4

3.   belo is my command to get BSL version 

        [80] [01] [00] [19] [e8] [62]

        [ACK_ERROR_MESSAGE]Unknown ACK value!

4. does the UART need to add parity bit? I remember elder MSP430 BSL need to add this bit, but in FRAM BSL, never mention about it.

Thank you