I’m working on replacing the hdd on my friend’s 2010 or 2011 13” mbp- it still has an optical drive. It began when the laptop had trouble booting, sometimes it would hang on the progress bar when booting, other times it would boot and he could log in, but Finder would consistently crash rendering it unusable. He took it into an Apple store and they ran a hardware test and said he should think about backing the drive up if possible and replacing, but everything else tested fine. He brought it to me and asked if I could swap out the standard hdd for a ssd. We decided it was best just to do a clean install and drag whatever files he still needed over separately. I first plugged an Ethernet cable in, did a cmd+opt+r boot, and went to do an internet recovery. It loaded for about 5 seconds, then failed and displayed “apple.com/support” then underneath, it displayed “6002F”. I never found what this meant on the internet, but later when I spoke with an Apple tech, they said the error relates to hard drive, but never said how. I turned off the computer, then did simply a cmd+r boot, that ended the same way. I never get to the disk utilities window. I then tried a booting while holding “C” to boot from media (which is a thumb drive with Yosemite install files because that’s what I had handy). This will show a menu with an option to connect to a wireless network, then the only to boot is “Install Yosemite”. I choose that, and the Apple logo is displayed, then it loads/installs halfway and then hangs. I’ve left it alone overnight to see if it was just taking an incredible amount of time, and little to no progress was made. I then tried booting while holding the “Option” key to go to a disk select menu, and this just automatically goes into the Apple logo, then it loads halfway and fails. I have also reset the NVRAM and MC and repeated all of these different boot options, still with no success. Another oddity is that the SSD will not show when plugged into a usb dock, in either Win or OSX. It will show and format just fine when installed on a Win 10 machine and connected to the mobo via SATA cable. It may be because my dock is almost 7 yrs old? I have attempted to install OSX on the SSD with it only partitioned and not formatted, then also with it formatted as exFAT. Both yield the same result. Yet another facet to this mess is that I have once again repeated all of these options with a spare 2.5” hdd that I had lying around, and get the same results. It will show just fine in the usb dock though, in either OS, for what it’s worth. I’ve heard that holding cmd+L during an install hang will show you the log file of what it’s working on, however, I have not gotten that to work yet. I have also tried booting into terminal, then installing by an installer -pkg command, but I can't seem to get it correct as I get an error saying what I'm typing is not a command. My two options going forward are to install OSX on the spare 2.5 hdd via USB dock with a working MBPr, then attempt to install the SSD and boot it in the old laptop. I would get a replacement SSD from Samsung just to remove that as a factor. The other option is to boot the old laptop into target-disk mode with the SSD in place, and attempt to install OSX from my MBPr. It’s almost personal at this point to get the laptop running, but I’m in dire straits. If these last two options don’t help, I’m not sure what I have left other than to send him back to the Apple store. Any ideas? Sorry for the ridiculously long post TL/DR: Can’t install OSX on Samsung Evo 850 in 2010/2011 mbp. Tried basically everything. Any ideas?