Thread: About 37xx converted to 34xx satellites reception accuracy

You guys are so verbose I've pumped through my brain so many english words today Not sure I remember all the important things you've said.

Originally Posted by Neil

Suggestions are welcome, but if kunix comes up with another fw mod that's what i'll be using regardless [if it doesn't brick it of course] .

I'm looking at this topic and your accuracy tests. I'm afraid the next mod would require digging into how fw_all.bin processes GPS chip output, as this seems to be the only place which could cause problems. So this won't happen too soon for sure.
I have a thought that maybe 34xx firmware processes signals from MT3328 chip in a different way (maybe somehow retarded way), as this chip is only present in older 34xx devices. It would be very interesting to find such 34xx device (with MT3328 inside) and run 37xx and 34xx firmwares on it and compare the accuracy with other 37xx and 34xx devices.
Also I don't like that using GPS firmware from 37xx with 34xx fw_all.bin makes the accuracy even worse. It could indicate that GPS firmware and fw_all.bin are tightly coupled somewhow and everything is even more complicated.
Also it would be nice to see the output of different levels of GPS chip signals processing. I don't really believe in track log, as it was already processed with different filters and probably adjusted to match the nearest road.

Originally Posted by Neil

The 37x0 won't flash using original boot.bin but will flash full 34x0 fw. Whatthe! Weird hey? You bet it is, and my layman's guess is that's simply because the 3790 and 3490 are not completely identical physical hardware. So flashing a 37 to 34 is like trying a kid's pony saddle out on a racehorse, you might get it to go on but it won't work property.

Yes, they seem to be quite different in some places. But 37xx bootloader doesn't work with 34xx fw_all.bin just because 34xx fw_all.bin is too big, no mystery here, and gfwpack solves this problem by making fw_all.bin smaller, though it's quite useless for us.