DNW cannot communicate with Mini6410/Tiny6410

Hello,

I am currently trying to upload a new image to a tiny6410 board with an SD
card that has superboot burned to it. I have followed all the steps to
connect to the tiny6410 using DNW. However, when the device boots up, there
is no output whatsoever on DNW's display.

I have tried this on several machines, and also on a mini6410. I also tried
entering the keystrokes directly in DNW as suggested by previous threads on
this topic. No dice. Supervivi gives an error on booting. Does anyone have
any idea what's going on here? Thanks in advance,

Roan

Small addendum: The error supervivi gives on booting is (translated from
Dutch): "Cannot initialize the application properly (0xc0000135). Click OK
to end the application."