Hello, The Khadas Team, like many in China, are unable to return to work due to the Coronavirus quarantine, so official help maybe a few days away.
In the meantime, I will attempt to run the latest 2020 Khadas SD card Ubuntu, but it will be several hours before I get back to the VIM3.
For passwords try…
User: khadas
Password: khadas
…Or
User: root
Password: khadas
I will post back my results after the test tonight.
Some info on NPU is available through Khadas Docs.