I have four devices, each with a different firmware version. OpenConfigEditor works on all of them. My latest device (Color) runs the app I build with SDK_481 (same as in blchinezu's SDK).
I believe that the firmware version on the Color is similar to the one on the Touch HD3, so I think your app should work when built against the SDK you have. However, there is a new SDK for the latest devices (SDK_6.3.0). Perhaps you could clone it from GitHub and try it out.
My Color device has gdb, and it seems to work in a pbterm session. If you don't have a working version of gdb on your device, then you might try the one I uploaded to this forum many years ago.
https://www.mobileread.com/forums/sh...27&postcount=2. It might help you debug your problem.
Finally, I provide source code of my app at
http://komary.net/pbimageviewer/. There are instructions for building with cmake against blchinezu's SDK, so you should be able to build it yourself. Note that the code covers many firmware versions, so it can get pretty complicated in places. It may not be great for learning from, but it should test whether the OpenConfigEditor call works.