Hi, @flavio!
Just to confirm if I understood right, do you want to install an image that is in a NFS folder?
If yes, you could use the image compatible with Toradex Easy Installer that Yocto saves in the output folder and the TorizonCore Builder images serve command. Please refer to this topic where I explain how to use it.
In order to use this command, you will need to use Toradex Easy Installer too to be able to select your custom image in the installer.
Please, feel free to ask for help if you have any trouble or doubt.
Best regards.
Lucas Azeituno