Hello
I assume your bootloader is locked.
You can try to boot to recovery (Power + Vol up) dans wipe data. On the most case this could fix your problem.
BTW you'll lost all your data.
I've try FDE and my antutu score has been increased to 410k (antutu doesn't really mater)
In real usage SOT is slightly better but i don't know if it's FDE or the new update which increase it.