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hey can I upgrade the CPU at Asus Laptop M509BA-EJ051  ?

Hi, Looking at this video for an Asus M509BA it’s hard to tell, but I’d say no you can’t. I think that the CPU would be hard mounted onto the systemboard, under the cooling fan. See 1:58 minutes into the video for the best view. The laptop model also appears to be a recent release, barely 12 months if that, so if you decide to open it to find out you may be voiding the manufacturer’s warranty, if the laptop is not that old. Just a thought.