Just today we had the same problem, what we did was the following:
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First turn off your robot or anything powering the spark
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Leave pressed the “mode button” I don’t quite remember the name of the button, but the one you change to break or coast
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while pressing the button, connect it to your laptop via the USB C port on the spark
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Keep hangin for about ten seconds pressing the button and now open the Rev Hardware client
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You’ll see that the spark entered in recovery mode, select the spark and you’ll see a button to select the type of controller, select SPARK max
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Click on the update button and wait for it to update
And then your spark max will be ready to go
Hope it helps and your spark recovers
Good luck
-Armando, Imperator 5887