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4	4	The latest firmware upgrade is: BC660KGLAAR01A05_01.203.01.203
5	5	You can use the AT+QGMR command to query the firmware version
6	6	The method to upgrade the firmware of the NB module is as follows:
7		-Step 1: First, completely erase the program of the NBST module.
8		-Step 2: The NB module needs to insert a SIM card and ensure network connectivity.
9		-Step 3: Use TTL-USB serial port tool to connect TX and RX, GND of NBST,
	7	+~1. First, completely erase the program of the NBST module.
	8	+2. The NB module needs to insert a SIM card and ensure network connectivity.
	9	+3. Use TTL-USB serial port tool to connect TX and RX, GND of NBST,
10	10
11	11	[[image:1720682410182-594.png]]
12	12
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16	16
17	17	[[image:1720682438315-576.png]]
18	18	No welding is required, just touch it with DuPont wire.
19		-
20		-
21		-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.
22		-Step 5: After opening the serial port, send the AT+QIDNSCFG=0, "223.5.5.5", "8.8.8.8" commands and return OK
	19	+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.
	20	+5. After opening the serial port, send the AT+QIDNSCFG=0, "223.5.5.5", "8.8.8.8" commands and return OK
23	23	Send AT+QFOTADL again= http:~/~/repo.dragino.com/release/NB/Update_BC660KGLAAR01A05_01.002.01.002-R01A05_01.203.01.203.zip command
24	24	The device is starting to upgrade firmware, as shown in the following figure:
25	25
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32	32	The firmware upgrade was successful.
33	33
34	34
35		-You can use **AT+QGMR** to check the firmware version.
	33	+You can use AT+QGMR to check the firmware version
36	36
37	37	[[image:1720682568103-178.png]]