NINA-B3 series - System integration manual
UBX-17056748 - R13 Software Page 24 of 72
C1-Public
5. Select Tools > Software Update.
6. Check that the correct COM port is shown in “Settings”. Select File and choose the NINA-B31X-
CF-<version>.json file from the unzipped u-connectXpress container.
7. Select Update. The module then reboots using the secure bootloader and flashing of both the
SoftDevice and application starts automatically.
Updating software with AT commands
☞ You can send AT commands to NINA-B3 to execute certain tasks over the serial interface, using
open-source terminal emulator software that supports XMODEM, like TeraTerm or ExtraPuTTy.
Alternatively, you can send all AT commands described in this section using the s-center software
in AT mode. The examples given in this procedure have been created and tested on EVK-NINA-B31
using TeraTerm. See also the u-connectXpress AT command manual [4] and Bootloader protocol
specification [5].
The bootloader must be running when the software is “sent” to the module. You start the bootloader
using either:
• AT commands
• Pressing the SW1 and SW2 buttons simultaneously during a module reset (initiated by setting
RESET_N low). The bootloader prompt “>” is seen when the boot loader mode has started.
See also Module reset.
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