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Background
Getting started with the Volvo Cars app | Volvo Support UK - Volvo Cars
Bricking the ECU: If you attempt to flash a file that isn't a perfect match for your hardware ID or VIN, the ECU can become "bricked" (permanently unresponsive), requiring a costly replacement.
Assuming you have found a (potentially free) flash file and you have a working diagnostic setup, here is the general process: