BE CAREFUL!
Tried to go back to firmware 1.01 but messed up...
In DFU mode, I tried to delete the 2.0 files...
BIG MISTAKE!
LINUX MINT:
The MHP50 does work, shows 1.01 on the display but DFU mode does not work anymore!!
Also I cannot change some values anymore in the menu's, I need to edit the config.txt file in USB mode
I can enter DFU mode, MHP50 does show up in the filemanager but I get an error "Could not display contents of "MHP50_DFU": error when getting information for file "/media/user/MHP50_DFU/.trash-1000": input/output error
This was on LINUX.
In Windows 10, I CAN enter the MHP50_DFU directory with these contents:

Deleting the .trash-1000 directory is not possible: not found error.
Dare not to mess with it any further..
Oh well, just another day... :'(