Winging it

So my 'running truck' * is a Japanese imported car, converted from kph to mph. As a result, I was never 100% confident the speedo was always accurate and, apart from that, the "white on grey" dials aren't great to read in poor daylight conditions. This is not ideal. *running truck - truck for running, it can be used as a mobile aid station etc. The previous one (RIP) was my "tri truck" then my "tt truck" before becoming "trail running truck" A speedo that says it's km/h, it isn't. So a more accurate display would be neat. I had intended on cobbling something together with one of the GPS modules I have, an ESP and a XIAO round display, I thought that might look pretty funky.... but... time. However, our new car has a cool HUD that displays speed (and various other bits) so I thought that might be neat, and then discovered that you can get a "dirt cheap" GPS HUD device off the internet. Well that'll be a lot easie...

Capsure Hacking #3  Third post on this topic, see also post 1(JTAG connections) - and post 2 (USB decoding) .    So after the Capsure USB hacking , and with a little more knowledge (which can be a dangerous thing*) (*see later) what can we do with access to the flash memory? The bootloader has a built in "view NAND" tool (see end of last post ), in there we can see the contents but there's no direct download/upload option, *but* we now have a JTAG connector on this board added in the first post . How hard can it be?  I pull out a full memory dump, I *think* this means I've got a copy of everything. (*see earlier 'danerous thing' comment) so blunder ahead.   Where's the memory  We have a little bit of knowledge from the datasheet which I've been poring over: So what can we change? What effect will it have? I'd been intrigued by that QC firmware I'd accidentally installed earlier which complained about FW incompatibility, and looking at the full...