BigSur reinstallation issues

  • Vendor: Dell
  • Model: Inspiron 15 5548
  • Processor: Intel Core i7-5500U (2 @ 2.4GHz) (15W) (Broadwell-U)
  • Display: 15,6" FHD Touchscreen panel (1920x1080 @60/48Hz)
  • Hard Drive: 500 HDD WD
  • Memory: 16GB DDR3 (1600MHz)
  • Integrated Graphics: Intel HD Graphics 5500
  • Discrete Graphics: AMD R7 265

    I'm trying to reinstall BigSur on my notebook, however, I'm using the same EFI that worked before but...

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Author: TLSXVIII