Hello ,
I think the project of "sfs" is i send to you , i can download and debug it well on TRK-KEA128 board.
1) Please be sure the firmware of your board from the computer management, does it j-link ?
take a screenshot about this to me :

2) Disable all of the breakpoints in your project before download.
3) You can also take a screenshot about the steps when you download .
Hope it helps
Alice