Hi, i typo'ed: > deletion of GPT partition 2 because it overlaps > with the EFI partition,
Partition 1 needs to be delted. Number 2 is the EFI partition. Further it comes to me that the gdisk session is best done one the USB stick with the ISO already copied onto it. This will give gdisk a chance to install the backup GPT at the real end of the device. If re-usal of the nearly-GPT in the ISO yields no success, try to let gdisk convert the MBR partition table to GPT. For that you will have to copy again the original ISO onto USB stick, because the original MBR partition table did not survive gdisk's previous conversion effort. Have a nice day :) Thomas