There are some datacenter SSDs rated that is set to 520 byte sector as far as I can tell not always can be converted to 512 byte sector due to hard lock on the firmware's settings. Was purchasing datacenter SSD drives to get high TBW endurance and still will do in the future, more carefully this time. And there is another way with consumer SSDs is over prevision your SSD by partitioning less than the full capacity but this is not best solution as not all SSD quality is created equal too both in firmware and hardware enabled for datacenter rated is not same as consumer SSDs.

Some with largest capacity in each model group can exceed 500TBW or more, in some case for example Intel DC 3610 1.6TB is around 8PB which is really large endurance.

I know there is wear number that had already went up on these used drives but sellers does not indicate this for each SSD drive so just be mindful of this.

The biggest draw was good prices but please do not make this mistake like I did, just once luckily and was not too expensive, whew.

Well, in this SSD of interest is Micron P400m this mode bought in error was 400GB model, there is another model with same string is P410m, are SATA, as far as I can tell these two most commonly sold on auction places are usually 520 byte sector by their model string ending in -2S1AA. Not compatible with linux and windows and other OSes that use 512b, unless you have a OS and hardware that supports this.

Make sure you do find and buy these P400m and P410m only ending in "-1S1AA" which is 512 byte sector.

Now that said, ask you with deep vogons knowledge who are working in datacenter ITs, ever you had successfully converted any of these OEM SSD firmware locked ones to 512 byte sector? Not the these public software methods like sg_format utility etc. As far as can tell, Micron locked these P400m firmware so 520b cannot be altered to 512b by request by Dell EMC.
I'm look at this in recycling hindsight point of view and purchasers' choices and we are not interested in hardware makers imposing their restrictions on our choices. Remember right to repair part is part of this.

Second, far as I can tell, I don't know if there a way even by secure erasure to 'unlock' these locked ones is not obvious to me.

Cheers,