As the log shown (mark as RED), writing characteristic is failed, the error code is 13 it means that attribute value length is invalid.
Could you help to provide the WICED Smart device side's source codes and log?
Hello Y I,
1. The problem we see with the OTAFU is when the new App is larger than will fit into the EEPROM.
2. What is the size of the image?
3. Are you downloading the .ota.bin file?