Table of Contents: 

• 1. Overview
• 2. The method to upgrade the firmware of the NB module is as follows:

1. Overview

The current firmware for all BC660-GL modules is: BC660KGLAAR01A05 01.002.01.002

The latest firmware upgrade is: BC660KGLAAR01A05_01.203.01.203

You can use the AT+QGMR command to query the firmware version.

2. The method to upgrade the firmware of the NB module is as follows:

Step 1: First, completely erase the program of the NBST module.

Step 2: The NB module needs to insert a SIM card and ensure network connectivity.

Step 3: Use TTL-USB serial port tool to connect TX and RX, GND of NBST,

No welding is required, just touch it with DuPont wire.

Step 4: The device needs to be powered on, open the serial port debugging tool, connect the COM of the USB serial port with a baud rate of 115200, and then perform FOTA firmware upgrade.

Step 5: After opening the serial port, send the AT+QIDNSCFG=0, "223.5.5.5", "8.8.8.8" commands,  return OK.

Send AT+QFOTADL again= http://repo.dragino.com/release/NB/Update_BC660KGLAAR01A05_01.002.01.002-R01A05_01.203.01.203.zip command,
The device is starting to upgrade firmware, as shown in the following figure:

Successfully upgrading firmware will prompt the following message:

The firmware upgrade was successful.

You can use AT+QGMR to check the firmware version.