Trained professionals only!
Managed to brick an engine ECU on a customers forklift truck earlier this year during a software flash. Got a new ECU, but flashing it resulted in the same failure. A lot of cursing and trail-and-error resulted in the conclusion that the power supply to the ECU was interrupted during programming.
So I tricked the power supply by bridging a relay and feeding the ECU directly from the battery. Successful!
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