How to change out the hdd to this ssd?
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MacBook Pro 15" Unibody Mid 2012 Hard Drive Replacement
this SSD have same size 2.5 inch and same connection SATA III so just swap it :)
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I did that but it gives me a circle with a cross.
Than you need instal macOS. Just make bootable USB drive (16GB+). Do you have any other computer ? Or your old drive still working ?
EDIT: I think that the lates supported macOS for your MBP is Catalina 10.15
Just boot up under Internet recovery via either an Ethernet or WiFi connection.
References:
@danj Ok, thanks
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