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CC3200: the wifi signal

Part Number: CC3200
Other Parts Discussed in Thread: ENERGIA, , UNIFLASH

I buy a new cc3200 launchpad, and then use uniflash software to update the service pack (firmware)to latest version(2.11.0.1). Following the instruction ,i download the example of create network (AP mode) with energia. When opening the wlan of phone to search this wifi, i find the singal of wifi is only one grid and not steady. By searching on the internet, i think updating service pack is  this reason.  I want to ask how I should restore the firmware to the original