CC3100MOD: Unable to flash the service pack to CC3100MODR1

Hi Everyone,

i am unable to flash the service pack to CC3100MODR1 and here is the log from Uniflash , i tries shorting or touching the nHIB pin to ground still unsuccessful 

[23:43:35] INFO: setting break signal

[23:43:36] INFO: detecting FTDI for device reset

[23:43:36] ERROR: No device USB ports were found

[23:43:36] INFO: --- please restart the device ---

[23:43:51] ERROR: ---reading ACK signal failed---

[23:43:51] WARNING: ---seting break signal to false failed---

[23:43:53] INFO: setting break signal

[23:43:54] INFO: detecting FTDI for device reset

[23:43:54] ERROR: No device USB ports were found

[23:43:54] INFO: --- please restart the device ---

[23:44:09] ERROR: ---reading ACK signal failed---

[23:44:09] WARNING: ---seting break signal to false failed---

[23:44:12] INFO: setting break signal

[23:44:13] INFO: detecting FTDI for device reset

[23:44:13] ERROR: No device USB ports were found

[23:44:13] INFO: --- please restart the device ---

[23:44:28] ERROR: ---reading ACK signal failed---

[23:44:28] WARNING: ---seting break signal to false failed---

[23:44:28] FATAL: --- Can't connect to device !! ---

[23:44:30] FATAL: Error connecting to the device. Please check your COM port settings. Error code: -3

[23:44:30] INFO: > Executing Operation: Disconnect

[23:44:30] Operation Format returned. 

I have successfully flashed the same service pack to CC3100BOOST board using uniflash ,

what am i missing ?

please help

Thanks in advance

-Chiranth