Default [Q] Zopo ZP980+ OTG is not fully functional

Hi. I bought new Octa Core ZOPO ZP980+. All is fully function but OTG is functional with mouse only, but with sandisk cruzer contour 16GB flash drive (which is fully function with OTG cable on girlfriend's Zopo C2) is not functional with new ZOPO ZP980+. Do you have any ideas how solve this problem? If I connect flash disc to ZOPO ZP980+ => no action from Android system.