I've done about an hour or so of research and can't seem to find any info about upgrading my toshiba laptops CPU in the a205-s4557 Model # PSAF0U-02L009. I know its old and the typical response would be get a new laptop or something along those lines but this is a project for fun not necessity. I was given this laptop and upgraded the hdd to an ssd and I added some RAM now I'm wanting to see if I can upgrade the CPU but I can't seem to find any info. I haven't found anything telling me I can or can't upgrade or anything significant for that matter. I would truly appreciate any leads or concrete info on if I can or can't upgrade and if I can what is the fastest CPU I can upgrade to. Oh, If anyone can post links to point me in the right direction that would be great also.