The CPU was soldered to the mainboard. What article, service manual or such gave you hope you could install another CPU?
In short, CPU upgrades in close to 98% of laptops is not possible for this and other reasons.
I have an HP Envy DV6-7213nr. I have been considering upgrading the cpu to a faster one, but I am not sure what is compatible with my motherboard. I currently have the AMD A4 4300m installed. I was considering either the A8 4500m or the A10 4600m. Does anyone know if either of these can be used, and if so would they make a noticeable difference in performance. I have already added 4gb of RAM to the system and have a Samsung SSD waiting to be installed.

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