OTA image has invalid magic byte - (Encrypted binary update - OTA )

[Vineeth]

Hi,
I'm working on Flash encryption on ESP32 (using ESP IDF framework V4.4 in Visual Studio Code IDE) with pre-generated key on host machine. I was able to burn the key on esp32 and I merged the encrypted binaries (used espsecure.py to encrypt the binary with pre-generated key) (app.bin, bootloader.bin and custiomized_parition.bin) into one binary (final.bin)and I able to flash it and it was running without any error. When I try to update the image via OTA (used encrypted app.bin ), inside esp_ota_write(), it was thrown the error message "esp_ota_ops: OTA image has invalid magic byte (expected 0xE9, saw 0x27)".Could anyone pls help me on this, what i'm missing?