Thanks very much, it’s stupid but I didn’t think it was not a real update but a separate app 
Of course it works 
Is there a method to install an app in a specific app slot without recompiling it? not that I would be a newbie in C/C++ and even assembler on various platforms, but I’ve never used this toolkit (either IAR or the GNU toolkit for the quad) and don’t have enough time to play with it and the sources.
Still have no clue why I had to try repeatedly to update the sys and main app and why the update didn’t work in linux anymore, as it previously did.
Thank you
Florin