Based on the information from your SSD, we can see that you have the OEM version of the Intel® SSD 535.
From our retail units, we don't have the 256GB version, so most likely you have one from an OEM, this means that the write amplification firmware fix won't work for your disc.
Thanks for your reply. SSD firmware updates and fixes hosted in our site work with retail versions of our drives only.
We recommend checking the SSD OEM (Original Equipment Manufacturer) support website for firmware releases. Most OEM versions of Intel® SSD have information on the label indicating who the OEM is. If this is not the case, please check with your vendor.