Hi Johan Petersen
This case was answered internally. Solution was:
Dear Johan Petersen, Could you reinstall P&Emicro drivers? you can find them in the P&E page, it is the Windows USB Drivers. After you reinstall this drivers, please reconnect your FRDM board, it should install a new device driver, After this you should be able to flash your board
Your reply:
I think maybe my new computer is incompatible with the drivers (the computer have USB 3.1).
A managed to use an old computer, and everything works fine.
Regards
Jorge Alcala