Unfortunately I don't have a desktop PC anymore. But I will use my old Fujitsu Siemens Laptop, also Win7 but at least english. If you could have a look at the RGN Files, I would appreciate. On the ThinkPad I used all different ports, but even with the USB3 I was able to do the flashing. Another observation. After the GPS was sitting a while (off) and you connect it, at least then I can see the Garmin logo again. But only one time, thereafter directly to the bootloop again. I was wondering if the battery is discharged, because its not starting the charging cycle anymore. Nevertheless I tried to leave it connected to the wallcharger overnight and to the laptop. The latter how I discovered that its shown under portable devices after a while.