after flash TK1 shows mac address 00:00:00:00:00:00 wifi and ethernet not working.

After I flashed TK1 ethernet and wifi are not working and it is showing mac address as 00:00:00:00:00:00:00

Can anybody help

Did you use JetPack to flash your TK1?
Which wifi card do you have installed.
Which version of L4T is installed?