Can somebody please explain how do I transfer files from pc to umi emax, pc doesnt detect either the cable (filling cable part) or random cable i have with the same connector?
Your phone should be identified as an MTP device, that doesn't need specific drivers. Pull down the tool bar after connecting to USB and check whether the MTP option is chosen. Maybe you should use another USB port of your PC.
Maybe you can try other professional data transfer tool.
AirDroid is a nice choice to transfer data between your phone and pc.
Such android transfer tool allows you to transfer data wirelessly.
Give it a try.