This is the only 100% working solution:

hashes and all childish stuff described in here and everywhere do not work for Acer W510/511. Their BIOSes completely locked by Acer. There is no battery (eprom), no hashes - nothing to do as you could do usually in such case. Thats because of Acer do really intended to charge you with 100 bucks for solution of these stupid problem. But, fortunately there is existing much more better alternative, please follow these link. All you need is a flash drive formatted as FAT32 and 20 bucks. Good luck!