ST STM32L4 Manual page 142

The STM32 flash memory is divided in different regions:
1. The first region contains a custom boot loader
(required for firmware update)
2. The second region contains the application firmware
3. The third region is used in a firmware update
procedure to store the new downloaded firmware
before updating it, and to save the Wi-Fi credentials
inside the Meta Data Manager. The Meta Data
Manager is placed at the end of the Flash
Flash the IoT node
Using Installed Script (Cont'd)
142