Hello,
I could solve my problems by Gijs's comment. Thank you very much.
SO, why don't they explicitly describe that "CC2540_USBDongle_HostTestRelease_All.hex" is the file you should download to the dongle via the Flash Programmer ?
I don't see any explicit description in the CC2540 Mini Development KIt Quick Start Guide nor in the Software Developer's Guide which hex file should be used for the dongle and keyfob.
BR,
Ichirou