I was trying to read a dme with hextag... I had read others ecu with it and same power suply.
on the dme it came up poor power suply... I got a stronger one... on 4th try... boom!!!
lost the unit... my question is... can it be repaired ??
it still reads cas's. but no more ecu reading.

What do you mean by stronger? You increased the power supply current or the power supply voltage?

Current... I tried 2 amps, then 2,5 amps, then 3 amps.. so on... Got same message... Poor power supply... I kept rasing .. until it starts reading... But in the middle of reading procedure I saw smoke coming out of it.. I disconnected power. But it was already damaged.

You probably damaged a MOSFET in HexTag which is responsible of switching power ON/OFF for Ecu. This MOSFET can handle up to 8A (for a short period) and it works easily at 3A so if the Ecu is functioning the IC should not get damaged as the Ecu consumes maximum 800mA while working.
You either connected to a damaged ECU (has an internal short) or you have a shortage in wiring while you were trying. In both cases you:
- Increased voltage to more than 14V AND
- insisted to push HexTag to supply power even with the Error Message (poor power supply or shortage in wiring).
You can contact support tomorrow to arrange a method for repairing your unit.

Ok... How to I get in touch with the support???... I would like to set it up for Monday...I am traveling.

Go to contact page of microtronik.com (or any internal page), you will see on bottom right side of the page a live chat window. You can use it contact them, or simply send an email.

EDC17C50 and EDC17C02 in factory mode all works perfect 😉

I've done both MEVD1724 and MEVD1728. I think current briefly peaked around 600ma, but averaged roughly 350ma. This does not require tons of current.
Be very careful that unused wires do not touch anything, or each other.