Hi, I assembly Prusa i3 with Sanuguinolou 1.3 ATMEGA 1284PU and Popolou stepper driver, preloaded with Marlin firmware. I open Repetitier-Host, use EEPROM CONFIGURATION to calibrate and step values . It works. Then press SAVE EEPROM. But the data was lost the next day, after power down of both PC and Prusa. I am not familiar with ATMEGA. Would someone tell if I need to to use another PC sofby Tsuisuicheung - Sanguino(lolu)