Driver PX2 flash tegra

Hello, we have a challenging problem.Please help us.We install the SDK packages according to the website :https://developer.nvidia.com/drive/driveinstall . The following error is found in the flash step:
1.Flash tegra A .The host PC cannot work when the code is displaye on the host screen that " timeout waiting for sudo password prompt… 1"and " timeout waiting for sudo password prompt… 2"

2.Flash tegra B.[4.563091] pcleport 0000:00:01.0 ARE: Mutipe corrected error received: id=0020

3.the Drive PX2 screen turned black (No Signal)

Hello xiongshuo,

Did you connect USB cable between DPX2 and HOST PC?
And please see DPX2 getting started doc in https://developer.nvidia.com/driveworks/getting-started-with-drivepx2. Thanks.

Thank your reply.
Yes,I did it.It need membership required. I have submitted the application. Why haven’t I agreed to join ?