I lastly did it.
But there were some minor issue to correct, Jeff.
I followed the steps in this document: https://www.ghielectronics.com/docs/236/loader-tinybooter-update-g400
First I get an error in the DOS box, ‘Access denied’.
So I tried to analyze the content of programG400.bat. Unfortunately, this file has the wrong CRLF format for Windows. I only get one very loong line of something. No problem, I opened it in WordPad, which does the job and save … Access denied, aha.
The installation process only gives restricted access rights for the files, and so the empty log file also has restricted access rights and therefore … read issue above.
Note, that I am logged on as an administrator!!!
After changing the access rights, the whole thing works out without any problem and now the blue led is blinking …
Here my test fixture, also solved the problem with the pinning printed on the back side, what a nice idea …
With best regards