The directories are ok on the USB stick?
USB Stick connect and then press the button after aprox. 3 seconds forward.
Pressures perhaps several times, may not work the button????
If all else fails then you should replace the flash chip !
Link ist nicht mehr aktiv. On the log shows that the boot does not start. Usb flash drive does not mount. Flash the image can not be.
No, I'm not from Germany.