Here are some things to try after a failed BIOS update on Intel Motherboards - https://www.intel.com/content/www/us/en/support/articles/000005753/boards-and-kits/desktop-boards.html
If these fail, you may have to do a BIOS Recovery - https://www.intel.com/content/www/us/en/support/articles/000005630/boards-and-kits.html
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Here are some things to try after a failed BIOS update on Intel Motherboards - https://www.intel.com/content/www/us/en/support/articles/000005753/boards-and-kits/desktop-boards.html
If these fail, you may have to do a BIOS Recovery -
https://www.intel.com/content/www/us/en/support/articles/000005630/boards-and-kits.html