Excellent, I was able to create a backup of my BIOS. I have a question about the Y580-Y480_BiosFix tool: following the on-screen instructions, I typed the name of my backup BIOS (BiosBackup.bin in my case), pressed enter, then typed the name of the modified BIOS file (v801.rom, in my case, obtained from the attachment named "Lenovo Y580 - Y480 BIOS v8.01 (5DCN90WW) - Mod.zip" from the first post) then pressed enter. A file named v801Fix.rom was created; however, v801Fix.rom has a size of 0 KB. Does it sound like everything was carried out without issue? Will this 0 KB v801Fix.rom file be the one that I eventually put on my DOS-bootable USB drive? Also, in the next step (copying the fixed BIOS, the prr.exe tool, the fpt.exe, and fparts.txt to the USB drive), I understand that fixed BIOS is the file that was created using the Y580-Y480_BiosFix tool, the prr.exe is from the "prr tool" attachment (from first post), and the fpt.exe is from the "DOS version" flash tool attachment (from first post), but which fparts.txt should I use? From the attachments I've downloaded, I can see that there are three potential fparts.txt files: one that came with the FPT DOS attachment, one from the FPT Win64 attachment, and one from the 'Error 104' attachment. ------------Edit--------------- Actually, I just ran the Y580-Y480_BiosFix tool again and this time it created a file that is the same size as the the modified BIOS file before it was put through the tool (4,608 KB). I will proceed to copy this v801Fix.rom file to my DOS-bootable USB drive. However, I still don't know which fparts.txt file to use...