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Can you confirm that, the network connection is not getting dropped for some reason when you perform the OTA image download? I presume that you are using the stripped.elf file when you are downloading the update.
The memory should be sufficient to have both the FR_image as well along with the application.
Also, you say that you are using wiced 6.4 whereas your logs show you are using 6.6? Can you confirm regarding this?