I found how to do it :
After performing an NVRAM initialization, reconfigure any computers that print to this product so that the computers can recognize the product.
1.Turn the product off.
2.Perform one of the following steps:
●LCD control panel models: Simultaneously press and hold the right arrow button and the Cancel button. Keep these buttons depressed as you turn the product on.
●Touchscreen control panel models : Press and hold the lower right quadrant of thetouchscreen. Keep the quadrant depressed as you turn the product on.
3.When the Permanent Storage Init.message appears on the display, release the buttons.
4.When the product has finished the NVRAM initialization, it returns to the Ready state