I have tried everything suggested.
Now I get this.
If I do not press Command + R at the reboot, the Mac just keeps rebooting itself.
If I press Command + R at the reboot , the Mac just stops are the beginning showing an Apple logo with the progress bar stuck at about 10% and never proceeds.
It was working perfectly yesterday before I tried to update to Big Sur.
Please help.
Jing
hungdv
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