Hi @Divakaran ,
Are you saying that you need to update the image multiple times in production programming?
You can copy Toradex Easy Installer in SD card and boot Toradex Easy installer from there automatically. Once it gets loaded it will automatically detect and install your customized image but since SD card is slot is also not avaiable on your board, you can check boot tezi from ethernet (not supported officially, but you can test it)
Images built using yocto are Tezi compatible already.
Incase you have to just update rootfs, you can simple replace it in your image folder.