I soldered the GND from the NAND-aid to another GND point on the board.
Now this is the result:


      

It took some time due to stupidity of me but finally it's working 

Here the progress over serial connection:
The start of the MLC install




Message at the end of the install


Thanks again Tzirf for the assistance 👍

Nice job finding the issue. Glad you got it working!!!