hi guys . i recently try to downgrade from wp10 to wp 8.1 through wprt 2.1.1. I success fully downloaded and installed the software on my phone and phone started to boot normally into the windows 8.1 as a new device. unfortunately I forget to remove the USB cable connected and accidentally wprt 2.1.1 again started to install the software. I immediately removed my device and now my phone apprears in black screen no responce. I read all the tips in the thread  and nothing suite for my problem. please suggest me a suitable solution . i am having this 620 for more than 2 years. I am not ready to loose it plzz help me !!

Finally i recovered my 620 phone. Its simple turn off your computer for some time and relax. After sometime turn on your computer and connect your phone. Now your phone will be detected by WPRT 2.1.1. It will download the emergency drivers for 5MB and then reflash the os. Thats it ur back. This is how i recovered my phone.