User manual SEFELEC 5x Series  50   v1.06 
 
Press the area indicating the update of the function board Firmware to get the following screen: 
 
 
Press the "Cancel" key if you do not want to do the update.  
Insert the USB key with the update file. 
Then press the "Update" key and follow the instructions  
 
NOTE 
 
It is important not to turn off the device during the update