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I've not had experience with this part, or the TI software ecosystem, but this document explains the OTA process for this part and how the FreeRTOS and TI softwares cooperate: https://www.ti.com/lit/wp/sway021/sway021.pdf
The bootloader comes from TI. It seems the OTA image is stored in the secure file system (external flash). With ports to FreeRTOS you will usually find an OTA PAL that binds the OTA agent to the device. In the case of this part, it's here: https://github.com/aws/amazon-freertos/tree/main/vendors/ti/boards/cc3220_launchpad/ports/ota_pal_for_aws
In there, you will see it wraps the SimpleLink FileSystem API: https://software-dl.ti.com/ecs/SIMPLELINK_CC3220_SDK/2_10_00_04/exports/docs/wifi_host_driver_api/html/group___file_system.html
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