[REQUEST] Unlock Toshiba C875-15L bios to prevent crash booting with ssd

Hello, I'm looking for unlock my bios to try new option for fix issue with booting Samsung pro 840 ssd.

I have a Toshiba Satellite С875-15L (PSCBCE-04C002FR)
Also tried to contact Toshiba support but they couldnt help me

To explain my actual problem, I have recently change internal hdd to ssd drive for speed up my computer
( Model: Samsung 840 PRO 256Go (Brand New))

Since there, my laptop boot is random, (Bios setting is set to UEFI with fast boot and SSD to first boot device)

Sometimes, boot like a charm very fast and a pleasure to see speed runing Windows 8.1 after installing it, but also a lot of wasted time with trying to boot computer (no spinning wheel at windows 8.1 start and computer shutdown)

Sometimes it boot correctlyand sometimes not
(Wasted a least 1hour yesterday with this sh*t because don't want to boot again)
It make me crazy. So i revert back to origin 500gb hdd

-Motherboard Manufacturer and Model: Toshiba Satellite C875-15L
-Bios Revision: Original 6.80
-Bios Type: Insyde Corp
-Bios Link: http://support1.toshiba-tro.de/tedd-file...zip?666324

Thank you very much for help! Smile