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@AkosLukacs thanks for suggestions. Just wondering if you have any plans to flash your DT28 in coming days?
Abhigkar-
Probably won't have time to do it...
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The MDBT42Q firmware works on the DT28. You have to open it, and there is some kind of glue, so you need a sharp knife to open the back. I don't think it will be water proof without that glue.
The flash is protected, so you need something that can erase it. The 1-2$ "ST-link" clones can't do it with the default firmware, but should work with black magic probe FW. Or a j-link clone, or a raspberry, or...
There are a lot of test points on the PCB, soldered wires on them, and recorded the boot sequence with a DSLogic. Uploaded here: https://github.com/AkosLukacs/espruinostuff/tree/master/DT28But broke the LCD on mine, so I think that's the end for now...
AkosLukacs
For a start I think you can just flash the MDBT42Q, as that firmware is pretty bare bones. But you have to figure out the pins.
I have one, but first want to grab some info about the communication, as there is no visible marking on them (at least couldn't figure out).
The LCD for example must be SPI, not parallel as there are not enough traces in the flatflex going to the display.
Also it a has a different touch controller with more than two touch areas.
And can measure more than just hearth rate, so there must be some differences there too...