Tell them that it is the update itself that is causing the problem.Got another SMS:
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bla bla, COVID, bla bla, reduced working, bla bla remote diagnosis can take a few days, bla bla.
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I SMSed back: "re-stage the f****ng update".
SC re-staged version 2020.12.5, I removed all USB devices from their plugs and re-installed it.
Half an hour later update was completed, I re-inserted the USD pendrive, had a quick flash of the LED on pendrive, and after that nothing else.
The car still doesn't see the USB pendrive.