Thread: (Nuvi 660) Is it possible to convert OEM FW to regular one?

Some (final) update --

I was suspecting that maybe I should have a smaller second image, so I made another logo file with the first 480x272 but the second 480x212. This time nothing got displayed at all (splash is just black; pc-connect screen is blank).

I also re-tried the 2-image version with two very different images, and was able to confirm that the (barely visible) garbled pc-connect screen is indeed some sort of distorted version of the first image. Another thing I found is that the number of padding bytes at the end does not seem to matter (the overall size does not have to be multiples of 1024).

At this moment, I strongly feel that the logo file of the 660 uses a single 480x272 splash image, but somewhere in the logo data there is a parameter specifying how the USB screen should be derived from the splash -- that is what I am missing.

I will stop experimenting further as there is no usable reference data and this now becomes random/blind trials. I am mostly satisfied with what I got -- I removed the annoying DTG logo, and the pc-connect screen is tolerable.

Thank to everyone who helped. You guys are great.

Happy navigating!

Sean