Uniflash 无法正常format

CC3200-LAUNCHXL 开发板

串口未占用，SOP跳了flash ，J6J7 也跳了flash ，

[22:38:22] Begin Format operation.
[22:38:23] INFO: > Executing Operation: Connect
[22:38:25] INFO: setting break signal
[22:38:26] INFO: detecting FTDI for device reset
[22:38:41] ERROR: ---reading ACK signal failed---
[22:38:41] WARNING: ---seting break signal to false failed---
[22:38:43] INFO: setting break signal
[22:38:44] INFO: detecting FTDI for device reset
[22:39:00] ERROR: ---reading ACK signal failed---
[22:39:00] WARNING: ---seting break signal to false failed---
[22:39:02] INFO: setting break signal
[22:39:03] INFO: detecting FTDI for device reset
[22:39:18] ERROR: ---reading ACK signal failed---
[22:39:18] WARNING: ---seting break signal to false failed---
[22:39:20] INFO: setting break signal
[22:39:21] INFO: detecting FTDI for device reset
[22:39:37] ERROR: ---reading ACK signal failed---
[22:39:37] WARNING: ---seting break signal to false failed---
[22:39:37] FATAL: --- Can't connect to device !! ---
[22:39:38] FATAL: Error connecting to the device. Please check your COM port settings. Error code: -3
[22:39:38] INFO: > Executing Operation: Disconnect
[22:39:38] Operation Format returned.

FTDI的驱动有没有安装？在PC的硬件设备中能否查看到该串口？

驱动是正常安装的

参考下此帖： https://e2e.ti.com/support/wireless_connectivity/simplelink_wifi_cc31xx_cc32xx/f/968/t/470385

1.我按照帖子里面的建议，短接了J6J7靠近FTDI的那边的引脚，打开超级终端输入字符，但没有任何显示。

2.我测量了VDD_ANA1与地的电压，电压很小，几乎没有,VDD_ANA2 = 3.3v，VDD_DIG1 = 0.15v

在这之前成功烧写过流水灯的程序。然后再执行format就这样了

还是没有成功，我该怎么办