You may want to connect the Intel® SSD 520 to the SATA 0 port in your motherboard; if the SATA controller mode is RAID, try with AHCI or IDE. Otherwise try using a completely different system.
I hope this helps.
I've tried ALL the SATA ports without any success. What do you mean by different system? A new pc/laptop?
Yes, you may try using any other computer. However, specifically for the Intel® SSD 520 Series, I need to correct my previous response since this drive does not have any new firmware update, I am sorry I did not see that before.