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Try the below script in the AT Command Tester tool
////Script: at!dawstxoff.at //This AT command is used to turn off the transceiver PA (WCDMA or GSM) in //in the Sierra Wireless modems in the Factory Test Mode. //Turn on the WCDMA transceiver PA AT!DASTXON WAIT=2 //Turn off the WCDMA transceiver PA AT!DASTXOFF
Output of the above script in the AT Command Tester tool
AT!DASTXON OK AT!DASTXOFF OK