Outstanding kit by iFixit for replacing the HHD.
Great guide, I followed it step by step and had no problem but one: when reinserting the cable into the new SSD, I had no room for my fingers. I had to loose the black plastic cover to the left in order to have a bit more room and succeeded.
Then, I added an extra check before sealing the screen, powering on the Mac just to be sure I reconnected correctly the screen cables.
Now the Mac is super fast!
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