Well, luckily for me I managed to fix my blu ray drive connection by snipping the wings of the bluray drive to MOBO ribbon cable off with an exacto knife, and then just shoving the ribbon cable in as far as I could get it. To makes things easier and to test if this works for you, when you have the PS4 open and are reattaching the ribbon cable, there is a small piece of green circuit board sticking out below the large silver metal bracer on your Bluray logic board. You can touch the gold plate on this piece to see if the blu ray drive is working again. When the battery is out of its socket but still plugged in, it should make 3 beeps when you press the gold plate. This means you have fixed the connection and can reassemble and update.
Hope this helps
This is in relation to error SU-42118-6