Best NOT to disassemble this connector when you can just pull out the IR sensor from the frame and tape it gently onto the logic board for doing your work. I found this connector to be stuck so hard, that even the use of one spudger on each side of the plug pulled the connector apart and the wires came out. I wish I had known how unnecessary this part was. Now I will have to buy the customer a new one.

Be very careful when putting the Torx screws back as they are very easy to leverage and seems to bend the white piece at some point, making me nervous they could crack it. Don't overdo these.

The left-most philips screw in this picture does not seem to go in properly. The best I could do was use the screw with least of the blue screwlock on it and then err on the side of leaving the white plastic a bit Ioose in that location.

I did this on a 2009 white unibody Macbook with a caddy that fit well, but I couldn’t get the second hard drive to show up in Finder, DiskUtility, or with ‘diskutil list’ in Terminal. System Report’s SATA Device Tree does show two SATA connections possible, so it seems like all is good up until the connector.

The previous optical drive was '“broken” according to the owner of the computer, which I presumed was just classic optical drive breakage, but perhaps it is down to the connector between the two?

Any other guesses what might be wrong?

But apple is not gonna do the repair beyond the warranty, so I don't believe it's a consolation that apple would do that repair when I buy computers to last me a decade. You seem even a bit optimistic about this.

This guides information does NOT apply to Redmi Note 4 GLOBAL. I have the global and it looks different inside.