@AkosLukacs thanks for suggestions. Just wondering if you have any plans to flash your DT28 in coming days?
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/DT28
But broke the LCD on mine, so I think that's the end for now...
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