在使用Uniflash对cc3200进行Format操作时，突然发生以下错误,搞不懂是怎么回事，网上也没找到解决的办法，想在这里咨询以下大神，
前提：之前使用没有发生问题（包括Format和program ），COM Port设置没有问题，SOP2处（J15与2已经连接），重新安装软件也没有用
[14:19:13] Begin Format operation.
[14:19:14] INFO: > Executing Operation: Connect
[14:19:16] INFO: setting break signal
[14:19:17] INFO: detecting FTDI for device reset
[14:19:33] ERROR: ---reading ACK signal failed---
[14:19:33] WARNING: ---seting break signal to false failed---
[14:19:35] INFO: setting break signal
[14:19:36] INFO: detecting FTDI for device reset
[14:19:51] ERROR: ---reading ACK signal failed---
[14:19:51] WARNING: ---seting break signal to false failed---
[14:19:53] INFO: setting break signal
[14:19:54] INFO: detecting FTDI for device reset
[14:20:10] ERROR: ---reading ACK signal failed---
[14:20:10] WARNING: ---seting break signal to false failed---
[14:20:12] INFO: setting break signal
[14:20:13] INFO: detecting FTDI for device reset
[14:20:28] ERROR: ---reading ACK signal failed---
[14:20:28] WARNING: ---seting break signal to false failed---
[14:20:28] FATAL: --- Can't connect to device !! ---
[14:20:36] FATAL: Error connecting to the device. Please check your COM port settings. Error code: -3
[14:20:36] INFO: > Executing Operation: Disconnect
[14:20:36] Operation Format returned.
