I got the unit from one of the customers (so ver number is unknown)
after booting the USR light(and all light below) flash for 1 second in a cycle of around 10 seconds(the USR blinks RED)
1+2 lights showing dim red and 3+4 lights are not showing anything
I tried to factory reset according to this but the result is the same.
P.s
Only the power is attached to the unit