How to get into BIOS of PX2?

When I use PX2 to install some softwares, however, the fault informations return back. Our company’s network need autorrations.

GPG error: trusty InRelease: Clearsigned file isn’t valid, got ‘NODATA’  (does the network require authentication).

And in the Ubuntu, I did not see the network sign. So I need to reinstall the OS. However, I did not get the way to step into the BIOS.

Dear xueheneg.mei,
It is not clear why you need PX2 BIOS to flash the board. You can use our latest SDKManager from Devzone and set up proxy settings in SDKManager UI to avoid authentication issues.