The teams use a single homologated ECU to prevent driver aids. I would assume it doesn’t have a downlink on-track to prevent tampering, but presumably with umbilical cord connected in the garage during red flag they can make changes, which the FIA probably sent over. Who knows.

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mtremsal 6 hours ago | parent [-]

No this all happened during the formation lap. So teams could clearly push settings changes live.

	▲	eszed 3 hours ago \| parent [-]
		The problem happened during the formation lap. They red-flagged the race and brought all the cars off the track. I don't know any more about the update mechanism than you do, but GP's theory is plausible.