Need Help Please….

i am facing strange problem
i have qmobile a6 and A10 both for flash, problem is when i connect usb in "ON"
position usb connection is perfect but when i connect in boot mode for flash show this error

Wait for phone…
Phone found! [ 5 ]
Brom Init not done
Boot Error!

Operation Failed
Elapsed: 00:00:10
Reconnect Power/Cable!

whats the problem?
please any body give me solution