dslrdashboard.info

In qDslrDashboard settings check that 'Use Canon local storage' option is disabled.
If it is disabled then try enabling it.

Press the ESC button

This is true for the new version of the OpenWrt, the one that is available on the site is an older version that works with MR3020/3040.
What version is the MR3020?

Please check this post: viewtopic.php?f=5&t=2101
this should help you verify your OpenWrt and ddserver installation.

Here is a debug build: https://drive.google.com/file/d/1vuBRl6y4XAj-G6IwZl8EwHTkWTZtFvLf/view?usp=sharing Just replace the qDslrDashboard.exe in an existing V3.6.4 folder and run the qDslrDashboard_Directx.cmd and qDslrDashboard_opengl.cmd The log files will be created in your Documents folder as 'q...

Did you try to run it with qDslrDashboard_Directx.cmd and qDslrDashboard_OpenGL.cmd? Both give the same error?

You need to use an USB OTG adapter and use it this way: R6 >= USB cable => USB OTG adapter => Android device For wireless connection don't use the 'Canon Connect' as it will prevent qDslrDashboard connection. Forllow this: - enable wireless on your camera - connect your Android device wireless to th...

What camera do you use?
On Nikon cameras after you activate the live view the camera controls are disabled by the camera (execption are the new mirorrless cameras)

Did you try running it on RPI 4 with a monitor attached to the HDMI port or only with VNC?

Dont know about the GL.iNet device, not sure if it is supported by OpenWrt.
For ddserver you are better with a Raspberry Pi Zero W (it needs external power).