This bios has been tested and proven to work....I am not sure of what to tell you since I do not know your computer.... Are flashing the bios correctly. If you're using DOS bootable floppy (w/o himen.sys) created in Windows, you will get an error like "can't present memory manager" while you update the BIOS (ie himen.sys) You may do either one of the two ways to resolve: 1. press F5 to bypass himem.sys 2. modify the parameter from /S to /X