Chosen Solution
Just did a straight swap of my logic board(820-3330-B) and it doesn’t recognize drive. Repaired with DU, with no results.
Logic board swap out: As you are running Catania your drive is running APFS. So a common issue is the replacement logic boards firmware is still the older version so it doesn’t know how to boot up under the newer macOS. I would use a bootable OS installer USB thumb drive to re-install the OS so the installer updates the systems firmware. SATA cable issue: This tended to be an issue with early versions of the system as Apple used at the time a SATA II (3.0 Gb/s) HDD and the cable was not able to support the higher data rate of the better 3rd party SATA III (6.0 Gb/s) HDD’s. To add to it this cable is fragile! Your Hard Drive Cable Is A Ticking Time Bomb As such when ever I replaced the drive with a SSD drive I always replace the cable as any defect in the cable will make you pullout your hair! But, you also need to not man-handle the cable! As that too will damage it. Don’t crease the cable as people tend to do that for the areas the cable needs to bend. Creasing the cable damages the thin foil wires within the ribbon cable. Instead I use an old BIC pen ink straw making sure the bends don’t exceed the radius of the straw. I use the straw to help form the curl. Make sure you get the newest version MacBook Pro 15" Unibody (Mid 2012) Hard Drive Cable and here’s the guide to put it in MacBook Pro 15" Unibody Mid 2012 Hard Drive/IR Sensor Cable Replacement
