I just received the BX3100 dev kit and decided to test it.
Following the quick start guide i connected the usb and identified both Serial COM Port.
Using a serial terminal after pressed the reset button and dev kit responded ready, i sent an AT command but got no response back.
Also tried to send ATI command as written in Development Board User Guide, but i got no response.
So decided to update the firmware. After the update when the reset button is pressed the dev kit reply:
rst:0x10 (RTCWDT_RTC_RESET),boot:0x13 (SPI_FAST_FLASH_BOOT)
configsip: 0, SPIWP:0xee
mode:DIO, clock div:2
Sierra Wireless Copyright 2018
But the dev kit still don´t respond the AT command