***SOLVED*** Just wanna share my experience: I don't know if somebody solved this problem before: "UNABLE TO CONNECT ,FILE SYSTEM NOT AVAILABLE" But from my experience I can see that this is not a problem that avoid from using H-E-N. For those having this error follow this steps:: 1-Unplug any USB cable from the phone. 2-Open h-e-n and choose the wanted speed. 3-Click on **VBUS BOOST ON** and wait for 10 sec. 4-Connect the USB flash driver tho the USB cable. Then plug the latter into the phone.Wait for 10 sec. 5- click on **ENUMERATE** Wait for 10 sec 6-then click on **MOUNT**] And here you go