I have just realized that I've omitted one important detail, in order to get an answer to my question, which is that I installed Chromium OS (instead of the official Chrome OS). So I can't just "turn off" the developer mode, because in that case I won't be able to keep Chromium on my Chromebook. That's why I need to modify the Bios.
I've been trying for a couple of days to look for ways to disable the Bios Write Protect on the Samsung Series 5 Chromebook - Model XE500C21.
The reason I want to disable the Bios Write Protect, is so I can remove (reduce to 2 seconds) the Developer Mode - Chrome OS Verification Warning that appears on every boot.
I've disassembled the whole thing and have iterated over every screw on the motherboard, to see which one might be the Write Protect Screw, without luck.
I'm starting to believe that it is a Jumper instead of a screw, however there is no visible jumper anywhere.
For reference and more information, please see the pictures on this Chromium Link (I have this exact model, Also Known as Alex):
I'm also attaching pictures of my own, so you may see the motherboard from both sides & the exact model:
Back of Motherboard: https://drive.google.com/open?id=0Bx1Xpc2h5JHZS0xLTFhJQUVyV05rRnkzZGtFczQ4QnFaamg0
Front of Motherboard: https://drive.google.com/open?id=0Bx1Xpc2h5JHZUW9kRjZFNF8wVWViOXZ5SFZrenVfQjNXOG9F
Chromebook Model No. : https://drive.google.com/open?id=0Bx1Xpc2h5JHZT0dNcmdyR1d4c3ZZY012QV9uY1UxX3VaZUJJ
Please, I would appreciate any help on the matter,
Thank you very much to all in advance.