1) Bricked device MODEL: Nuvi 1490T, Firmware version: 6.20, HWID: 972.

2) Why and how the device got bricked.
added latest Europe NT 2014.40 after adding my name to the 'author' with a tool I found here in the forum (I do not remember the name but I will look for it). Switched off and on ... gone

3) Symptoms: what's wrong in your device? stuck at splash screen

4) Does your pc sees your device ? NO

5) List all the procedures you already tried to unbrick it and their results and errors messages obtained.
I did everything as described in 'Trying to fix a bricked nüvi 1390' thread. I was able to enter pre-boot mode to use GarminCure3.exe and Updater.exe I tried to send either a Cure or an Original firmware to my unit. Updater.exe ended successfully in both cases but I was not able to enter mass storage mode in Windows or to start the device. It was still stuck at the splash screen. I also tried to use webupdater while in pre-boot, with no result (the unit was detected and I was told that the 6.20 fw was alread there).

6) Do you have Garmin USB Drivers installed ? yes Garmin: USB Drivers Updates & Downloads yes

7) If you don't know HWID get it by Use program G7ToWin to retrieve your HWID

8) Write down if you already read or tried GarminCure3 tool - the new way to create cure firmwares for Garmin devices
yes, read previous lines at point 5)

9) Can you reach preboot mode? yes If no ,have you followed this? Garmin Updater.exe v.2.8.0

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

11) Once you get a reply and a procedure to follow from our experts, please give an accurate reply about what you did and obtained results. OK