Hey a-lee!
Probably, you might have found out a solution to your problem, but I had the same timeout error and I found your post. In case somebody reaches here, it seems that the solution was posted elsewhere: USB device mode 192.168.55.1:8888 the site cant be reached
It seems that for the Deep Learning Institute, this image needed to be burnt in the SD card is the following: https://developer.download.nvidia.com/training/nano/ainano_v1-1-1_20GB_200203B.zip