In the source version, the GRSA key pair file was saved in the security directory in the system memory card. The private key was saved in the <label>_priv.pem file, and the public key was saved in the <label>_pub.pem file. In the target version, the GRSA key pair was saved in the NOR FLASH. The private key was saved in the <label>_priv.pem file, and the public key was saved in the <label>_pub.pem file. During the upgrade, the GRSA key pair file deleted from the system memory card was saved to the NOR FLASH.