<blockquote class="Quote">Thanks for your help.
It was a firmware issue after flashing again problem solved :)
But now another issue..
I have MKS tft 2.8 LCD display and i use Reprap full graphics display into firmware.
I use a PI for repetier server too.
When i power on the printer, the LCD command work fine until the PI complete booting then no more command works on LCD, just a basic display :/ Why ??