What nobody says:
1) be careful when you open the display, the adhesive stuff from apple is easier to remove than the replacement you will put - test your setup properly before you close the screen (I managed to break it when I opened it for the second time)
2) if you put the hdd from your fusion drive into an external case (usb), your mac won’t be able to mount the filesystem: make sure you copy or backup all your date before you remove the hdd. even disc repair tools were not able from the fusion drive
3) there’s not need to remove the blade ssd if you’re just swapping your hdd with an ssd.
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