I have a cilents acer aspire 4315 laptop, the cilents father was " mucking about" and has managed to password protect the bios, he has no idea what he did or how he did it never mind what the password is, I've "googled" this problem and tried all the backdoor suggestions, removing the cmos battery doesnt appear to be an option as I cant find a service manual for this model anywhere ( now I know there will be one ) I'm ready to throw the towel anyone else dealt with similar or know of a guanranteed to work sowtware solution?