利用uniflash下载程序出错

以下是错误信息：

[12:34:36] INFO: > Executing Operation: Disconnect
[12:34:36] Operation ServicePackProgramming returned.
[12:56:52] Begin GetVersion operation.
[12:56:52] INFO: > Executing Operation: Connect
[12:56:54] INFO: setting break signal
[12:56:55] INFO: detecting FTDI for device reset
[12:57:10] ERROR: ---reading ACK signal failed---
[12:57:11] WARNING: ---seting break signal to false failed---
[12:57:13] INFO: setting break signal
[12:57:14] INFO: detecting FTDI for device reset
[12:57:29] ERROR: ---reading ACK signal failed---
[12:57:29] WARNING: ---seting break signal to false failed---
[12:57:31] INFO: setting break signal
[12:57:32] INFO: detecting FTDI for device reset
[12:57:48] ERROR: ---reading ACK signal failed---
[12:57:48] WARNING: ---seting break signal to false failed---
[12:57:50] INFO: setting break signal
[12:57:51] INFO: detecting FTDI for device reset
[12:58:01] ERROR: ---reading ACK signal failed---
[12:58:01] WARNING: ---seting break signal to false failed---
[12:58:01] FATAL: --- Can't connect to device !! ---
[12:58:03] FATAL: Error connecting to the device. Please check your COM port settings. Error code: -3
[12:58:03] INFO: > Executing Operation: Disconnect
[12:58:03] Operation GetVersion returned.
[12:58:07] Begin ServicePackProgramming operation.
[12:58:07] INFO: > Executing Operation: Connect
[12:58:09] INFO: setting break signal
[12:58:11] INFO: detecting FTDI for device reset
[12:58:26] ERROR: ---reading ACK signal failed---
[12:58:26] WARNING: ---seting break signal to false failed---
[12:58:28] INFO: setting break signal
[12:58:29] INFO: detecting FTDI for device reset
[12:58:44] ERROR: ---reading ACK signal failed---
[12:58:45] WARNING: ---seting break signal to false failed---
[12:58:47] INFO: setting break signal
[12:58:48] INFO: detecting FTDI for device reset
[12:59:03] ERROR: ---reading ACK signal failed---
[12:59:03] WARNING: ---seting break signal to false failed---
[12:59:05] INFO: setting break signal
[12:59:06] INFO: detecting FTDI for device reset
[12:59:22] ERROR: ---reading ACK signal failed---
[12:59:22] WARNING: ---seting break signal to false failed---
[12:59:22] FATAL: --- Can't connect to device !! ---
[12:59:28] FATAL: Error connecting to the device. Please check your COM port settings. Error code: -3
[12:59:28] INFO: > Executing Operation: Disconnect
[12:59:28] Operation ServicePackProgramming returned.

因为之前板子上的CC3200有问题，我就买了一块3200替换掉之前那块了，然后就问题来了，挺多人遇到这种问题，尤其是自己做的PCB，我只是替换了开发板上的芯片，求解

是开发板没问题，然后你替换了一颗芯片就有问题吗？  一般这个问题，你需要按下复位键，就是说下载时需要按下复位按钮。

 下载和调试部分电路是没问题的，我试过用JTAG接口去接其他开发板的JTAG，是可以下载和调试的，可能是芯片焊接问题吧