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The discrete GPU (dGPU) is soldered on the motherboard and iGPU is internal to the CPU chip which is also soldered so there is no "automatic tool" that can be used to replace the GPU on MBPs.
 
Your going to need elaborate on your question. You cannot replace the GPU on any MacBook. This also applies to pretty much every other laptop.
 
Let me give more explaination
I'am looking for a bga machine to replace gpu's on MacBook pro?
So what is a good product price for a good one ?
With automatic and fine callibration
 
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