Quote Originally Posted by fgafga View Post
4- yes, but after holing switch for a while
Please detail how it was seen by PC. For example: By File Explorer (Mass Storage Mode), or in Device Manager (preboot mode), or by one of Garmin's programs like MapSource/BaseCamp, or ?

8- garmin cure, updater.exe doesn't recognize the device usb port.
Both pro-boot mode and Garmin USB Drivers loaded are required for that.

Are you sure pre-boot isn't available? Most devices which boot only to the logo still have preboot. If it was stuck on logo screen then it's easier to find and maintain preboot but devices which reach the logo then either turn off or attempt to re-boot are more difficult.

The vast majority of devices which will turn on and show the logo even briefly can be recovered with persistence.