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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
@AkosLukacs thanks for suggestions. Just wondering if you have any plans to flash your DT28 in coming days?