Preparation:
Download Huawei HiSuite and install it on your PC
Activate USB Debugging on your Ascend P7 (Settings / About phone / Build number)
Tap a serveral times at Build number till you got a Message on the Screen that you´re now a Developer.
Then again on (Settings / Developer options), and activate USB Debugging.
Start HiSuite and connect the Ascend P7 via USB to the PC
If you do this the 1st time, HiSuite installs a Daemon on the Ascend P7
Choose as Connection Mode on the Ascend P7 HiSuite
If everything is OK then you can disconnect...