I got it back from brick to full working updated 34## took a few goes and alot reboots to find the extact spot to get in to preboot mode.
Many thanks to all the people that helped.

Now I have a bigger problem !! G/F has gone and bought me a 3590lmt for my Birthday (next week) which is great. She was fed up with me moaning about my Garmin brick and took pity on me.

I don't have the heart to tell her that I fixed it, think I would be wearing it in a place that could hurt alot.

So now I have to put it back to 3760T mode and put it on Ebay. No point in having 2 and only 1 car !

Don't think there are any mods you do on a 3590 is there or am I wrong ?

Tob