Reviving a bricked



Keywords: reviving a bricked ecu,
Description: Reviving a Bricked ECU

I have had 2 customers who have inadvertantly pulled the flashing cable out in the initial erase part of the flashing process. This has caused some issues with the ecu's going into an unresponsive (bricked) state. I am able to initialize communications with them for flashing, sync the baud rate, but at the point where the software tries to unlock the ecu the flashing fails, i have tried flashing with different unlock codes including all 0x00 and all 0xFF but nothing seems to work.

So the ecu is bricked i hear you say, well here is where it gets interesting. There is a guy in the UK who is able to revive the ecu's from this state. He has done a few now. I have contacted him but he is unable to share the technique that he uses as it is some software that he has access to via the military. I know that it communicates with the ecu via the 4 standard flashing pins i.e. TXD, RXD, RTS, CTS and does not require the ecu to be cut open, so nothing fancy on the hardware side, so it must be sending some command to the ecu to reset it over the serial flashing interface. this effectively un-bricks the ecu and allows it to be flashed again as normal.

I would love to work out how to do this, as it would be great to be able to offer everyone the ability to recover from this bricked state should this happen to their ecu's. Anyone got any ideas on what the commands could be that are being issued to the ecu to reset it.






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