VAIO VPCEE43FX GPU

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ok im not sure if im in the right topic here so feel free to move it around if u have to.

So the other day one of my friends gave me his laptop because the technician where he brought it to repair the laptop told him the motherboard didnt work and that he had to buy a new one so he gave me the laptop so I can have the parts.
I decided to open it up and check it. The problem the computer had was the gpu chip. just a simple reflowing fixed it. But since the reflowing is not a permanent solution im going to do a reballding to the gpu chip.

So i was wondering if i manged to get my hands on another GPU chip like say a ATI radeo HD 7000m and reballed it instead of the original ATI Readon hd 4200m that it has. im pretty sure the BIOS wont support it. so I was wondering if a modding of the BIOS would be possible to make it work.

also if it needs a different or a higher CPU than the current one that it has ( turion II P560 dual core) to make this work i also have a AMD A6 quad core that i could change it for higher compatibility.

i just want to know if its possible to do this and if it is, help me with the modding of the bios. im not asking u to do all the work I would be willing to do the modding if u could tell me the steps and what programs i need to do this.

The laptop is a Sony Vaio VPCEE43FX