I found the solution for me. try this may be worked for you too.
first plug in your phone with data supportive cable with pc or laptop
go to device manager
look for portable device
for me nothing 4a ( mobile name A069) may different for other nothing model
If portable device not there. click on view at top and show hidden devices. you will get portable device option in device manager.
right click on your device model shown there (for me A069)
click on update driver
then browse my computer for drivers
again click on let me pick from a list of available drivers on my computer
there shows model MTP USB device, select this and click on next
it says windows has successfully updated your drivers
hope this will work for you guys.