Hi, and thanks for nice detailed instructions.

I have flashed my Nuvi 3790 HWID 1101 from Europe with nuvi34xx_GCDFile__820.rgn via RGN tool,
all was fine and also did backup NV to sd, before flashing.
Now I got problems getting into pre-boot mode Again for flashing logo with 34xx_350_logo_hid1376.rgn,
I try many many times with no luck.
Could it be possible to flash 34xx logo and enable all features via sd Card ?

Thanks in advance.