1) Bricked device MODEL, Firmware version, HWID. Astro 320, 4.50, 1339

2) Why and how the device got bricked. Not sure.

3) Symptoms: what's wrong in your device? Kept displaying "Memory Full" Now will only load Garmin page. Wont turn off without taking batteries out.

4) Does your pc sees your device ? No, even after running Cure.

5) List all the procedures you already tried to unbrick it and their results and errors messages obtained.
Wouldn't Master reset. Garmin Webupdater starts software installation then pops up with corrupted software message. Have installed rgn file made in Garmincure3 tool. It flashed cure firmware, updater said it had updated successfully. Astro turned off then back on like it should but did not go into mass storage mode, can not see on computer to delete files. Just went back to Garmin screen and disconnected from computer. When I put astro into reboot mode I can see its connected to computer in device manager. Have tried this process many times with different cables.

6) Do you have Garmin USB Drivers installed ? 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
How to unbrick a nüvi - step by step guide. Yes

9) Can you reach preboot mode? If no ,have you followed this? [Only registered and activated users can see links. ]. No, link is dead.

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.