Follow up to close the thread:
I downloaded the update onto a 32gB USB stick and stuck it in the slot in the arm rest. The screen message reported 2h39m to complete the update. In the end it took at least four times that. The update would sit at a constant time-remaining for hours. However, eventually it finished and all is well again!
By the way, during the update the Bluetooth would not connect and the CD player would not work. All working again now.
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Greg
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