what is the default bios password for acer v5-571?

[Muhammed Don]

my laptop keep telling me that operating system no found, so i tried to access the boot menu to do new installations then this bios password showed up

 

[Darkbreeze]

Yeah, unless you know how to disassemble your laptop far enough to remove the cmos battery, if it is even removable on your machine, you'll need to contact the manufacturer.