Hardware encryption issue with XPS 15 9550

Hi,

There's something wrong with the m2 ssd (PM951) used by Dell's XPS 15 9550.
I've tried everything I know to get hardware encryption working without success.
One would think that such old and basic feature for SSDs would be functional on this high-end laptop...

Has anyone succeeded in using hardware encryption with the PM951?
I'd also be very interested to know, from people that replaced this ssd, if they can now use hardware encryption (with samsung 950 pro or 850 evo for example).

What's not working so far :

1. There is no option to set HDD Password in the bios. This password is supposed to encrypt the ssd encryption key. In theory all SSD are encrypting data by default. All you need to do is set the hdd password to take advantage of it.

2. The "Wipe Data" feature in the bios. This is supposed to send a Secure Erase command to the ssd controller. This only changes the encryption key and renders all previously encrypted data unreadable. Unfortunately this has no effects on the pm951. The encryption key is left unchanged as I can still boot my Windows install.

3. On Linux with hdparm, I failed changing the encryption key and can't communicate with the pm951 controller at all.

4. On Windows 10 Pro, Bitlocker hardware encryption is not available. If you are prompted with this : http://img15.hostingpics.net/pics/113234bitlocker.png, it means that Bitlocker will be using software encryption.