you may see EN00 on XDSR Pro front panel after sending new software to set using Ethernet or USB flash memory.
to solve this you need to use serial update facilities to send a fresh software to your set using serial port and PC application called XPROLINK. follow the step as shown on photo. but while you run XPROLINK the set should be off from the main power and after running the steps turnon the set .
Wait until GOOD apperas on front panel .