What (e.g., MacBook Pro 2011) are you trying to update? What is your target operating system ? Are you seeing a specific error message during the process?
A USB flash drive (any size works, even as small as 128 MB). Required Software: Rufus USB tool Win32 Disk Imager to "burn" the image to the drive. Mac/Linux: BalenaEtcher to write the 3. Installation Steps Format and Write: exfathax img download install