Make FAT32 bootable USB FreeDOS with Rufus
Extract all files in bootable USB FreeDOS
H2OFFT-D.exe - Insyde H2O Flash tool for DOS Version 1.6y.00 IHISI v2.0 (181kb)
CDCN53WW.FD - Official BIOS from Lenovo website ver.53 (extracted from windows version of flash tool)
AUTOEXEC.bat - Launch flash bios
Y700_FLASH_BIOS_USB.zip (4.17 MB)