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Hello, I would like to install BigSur but it happens to me like MackTheKnife33, when I restart I get a black screen, I have the Radeon RX 5700 XT 8 GB, I have read that the card must be flashed. I have entered the link you put and most of the examples are on Windows systems, is there the possibility of flashing from Mac? How to flash so that the black screen does not appear. Thank you very much.