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Although ota2 files exist for platform/MCU/STM32F4xx/GCC/STM32F469, I've discovered then read on this site that there is insufficient RAM on the STM family e.g. 384K vs 640K as indicated by the diagram in WICED OTA2 pdf 2.1.2 OTA2 RAM Requirements.
The code size isn't the culprit but the loosing of 200K+ of SRAM. I tracked it down to: