14. Firmware updates
All products will experience maintenance, security and/or feature updates from time to time.
For the standard products these are maintained via the PCN process.
Customers can request the creation of a customized product including a "firmware freeze"
to ensure that they will receive their verified product even if the standard product is updated.
14.1. Firmware flashing using the production interface
Most Würth Elektronik eiSos wireless connectivity modules offer a production interface (e.g.
JTAG, SWD, Spy-Bi-Wire) for module flash access. Depending on the product, this interface
can be used by customers to erase the entire chip and install their own firmware.
Using the production interface is not intended to perform updates of Würth Elektronik eiSos
standard product firmware.
Production firmware images and binary files for Würth Elektronik eiSos wireless connec-
tivity modules are not publicly available.
Any certification, declaration, listing and qualification becomes invalid if the
production interface is used by a customer. Some products, in their documen-
tation, state exceptions to this invalidation under certain conditions.
Customers shall make the product specific firmware update interface available to their ap-
plication. These methods will use a wired (UART, SPI, etc.) or wireless (Bluetooth
®
LE,
Wi-Fi, etc.) communication interface of the module to allow updating the product’s firmware.
Details are described in the next sections.
14.2. Firmware update using the Proteus-III OTA bootloader
This method offers a possibility to update the firmware over the air (OTA). Therefore, the
Nordic nRF52 Bluetooth
®
LE DFU Secure Bootloader is integrated into the Proteus-III’s
firmware, which will communicate over the Bluetooth
®
LE interface. The OTA bootloader
mode is a distinct operating mode besides the normal operating modes mentioned before.
For this reason, a .zip-file can be provided, which contains all (bootloader, Softdevice, appli-
cation) parts of the firmware in an encrypted and authenticated package.
Before starting any update procedure, please check whether the installed firmware can be
updated to a new one:
Proteus-III reference manual version 1.3
© August 2020
www.we-online.com/wireless-connectivity
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