Macbook Pro Mid 2012 Firmware Downgrade

Question

Friends Macbook Pro Mid 2012 model evo to my computer upgraded with 840 samsung 6 months ago, and I was using it without any trouble. But in the last one month I got on my computer machine kernel cache error. With the installation and opening of the original disc, but SSDs doing was making trouble. I gave the service SSD y not change no matter what problems they have learned and change. Carbon Copy Cloner now and again with mac dupper supper time machine backup or recovery took my board if I did not open and the kernel fails again on cahce. Trim off mode, albeit not have them, even if I've tried everything. In the end, many SSDs ef firmware samsung site about a problem with the data transfer rate is found. Now I guess my goal to downgrade version 1.6 of EFI y How can I do my job, you'll see that information transaxle. Downstairs you can see information about my computer.
Model Adı:    MacBook Pro
  Model Tanıtıcısı:    MacBookPro9,2
  İşlemci Adı:    Intel Core i5
  İşlemci Hızı:    2,5 GHz
  İşlemci Sayısı:    1
  Toplam Çekirdek Sayısı:    2
  L2 Önbellek (her bir çekirdek için):    256 KB
  L3 Önbellek:    3 MB
  Bellek:    10 GB
  Boot ROM Sürümü:    MBP91.00D3.B08
  SMC Sürümü (sistem):    2.2f44
  Seri Numarası (sistem):    C0*****TY3
  Donanım UUID'si:    BCE9C44A-96BE-5140-AA5A-91AEEE244573
  Ani Hareket Algılayıcısı:
  Durum:    Etkin
<Personal Information Edited by Host>

Answer 1

It may have nothing to do with the firmware of your machine. What is the Kernel cache error? Bootcamp is one option to upgrade firmware of the SSD.
The Samsung SSDs come with Magician, which should allow you test the performance and integrity of the SSD. If it is a HW issue, you should be able to get a replacement. Samsung originally had offered a 5-year warranty on the 840 Pro SSDs.
The other option is a down-loadable .iso from Samsung Support website.