u-blox
Version latest

15 Software update

This use case shows what AT commands to send to start a software update. There are two ways to start the software update:
  • See more about the XMODEM protocol here
firmware

15.1 Update software by AT command

  • Enter XMODEM mode for u-connect software update using serial port
  • XMODEM-1K and baud rate up to 3 Mbps is supported.
Nr
Instructions
AT command
AT event
1
Start XMODEM protocol with AT command
AT+USYFWU=0,3000000
2
Now NORA-W36 is ready to receive the software using the XMODEM or
XMODEM-1K protocol
CCCCCCCCCCC...
3
When the software has been downloaded the module will restart
+STARTUP
4
Check the version of the software
AT+GMR
"1.0.0-001"

15.2 Update software by bootloader

Consider the following points when updating the software using the bootloader:
  • Enter the bootloader command line mode using serial port by AT command
  • Press SWITCH_1 and SWITCH_2 during startup (or after reset)
  • A command must be sent within 10 seconds when in bootloader command line mode. Otherwise, the device reboots in normal mode
  • For the complete list of available commands, enter ?
  • An XMODEM protocol timeout is invoked after 10 seconds if nothing is received
  • XMODEM-1K and baud rate up to 3 Mbps is supported
Nr
Instructions
AT command
Event
1a
Enter the bootloader
AT+USYFWU=1,115200
1b
Alternatively, press SWITCH_1 and SWITCH_2 during startup or reset to enter the bootloader reset
2
Wait for the > prompt
>
3
Change baud rate to up to 3 Mbit/s (optional)
r3000000
4
Start XMODEM protocol with the command x
x
5
Now NORA-W36 is ready to receive the software using the XMODEM or XMODEM-1K protocol
CCCCCCCCCCC...
6
Wait for the prompt to indicate that the software has been downloaded successfully
>
7
Enter the q command to restart the module
q
8
Wait for the prompt to display that the module has restarted in AT mode
+STARTUP
9
Check the version of the software
AT+GMR
"1.0.0-001"
Last updated: 25 August 2025
Need help?Contact Support
Questions?Contact us