you’re trying to use a USB HDD for the firmware backup? Apparently it has more than one partition, and the script is trying to use the first one on the drive and it’s failing.
repartition the drive or just use a USB stick with a single FAT32 partition
That worked, and yes. I only had an SSD and I had to use it as a USB. I didn’t have any on me, so yea. But thank you for the help! Now windows is fully installed:)