Bricked Oregon 550 - please help enter preboot mode

[VMatas]

Got friends Oregon, which was bricked during update process on year ago.

1) Oregon 550T, Firmware version - no idea, HWID - ?.

2) Bricked during updating to new firmware.

3) Shows only Garmin logo, immediately after switching on or connecting to PC, nothing more, cannot be switched off.

4) Does your pc sees your device ? NO. Drivers intalled, my 34xx and Montana recognized without problems.

5) List all the procedures you already tried to unbrick it and their results and errors messages obtained. Cannot enter preboot mode..

6) Do you have Garmin USB Drivers installed ? Yes

7) If you don't know HWID get it by Use program G7ToWin to retrieve your HWID Cannot enter preboot mode.

8) Write down if you already read or tried GarminCure3 tool I made cure firmware but can't upload it

9) Can you reach preboot mode? If no ,have you followed this? Garmin Updater.exe v.2.8.0 Cannot enter preboot mode. As per instructions [Only registered and activated users can see links. ] nothing happens.

10) Probably no , but do you have NV backup? NO

Please help if you have any ideas how to enter preboot mode. Thanks.