Cannot access BIOS on Tecra M11-11K after Supervisor password has been set

Hi there,
I've got 10 laptops Toshiba Tecra M11-11K here and they all have the same problem. If they turned on and I enter the BIOS to make adjustments for the first time, it's fine but if I want to return to BIOS after couple of restart (or even one), what happens when I press F2 is that the screen flashes and computer restarts. It does it on all 10 laptops. Anyone knows what to do with that? Flashing BIOS means I have to setup all of them before I can do that, which is a bit of a drag and I don't have guarantee it's gonna work. :/
Thank you,
J

Nope.
When I removed the notebook from the box, I entered the BIOS to change the BOOT order (Network First), setup Supervisor Password and changed SATA to Compatibility mode. Then I saved changes and rebuild the notebook from a WDS.
When done I wanted to change the boot order to HDD only but everytime I press F2 to enter BIOS, the screen only flashes with a blank screen, and computer restarts and I'm back at the Toshiba logo (the one you see when you turn on computer) and that is happening everytime I press F2 to enter BIOS.
It only restarts and comes back with Toshiba logo. Press F2, it restart and Toshiba logo is up again. :/
I tried to update BIOS, but no luck.
I can enter the BIOS only once, when unpacked from the BOX. After that, no chance. 10 laptops have the same problem.
Model Toshiba Tecra M11-11K (PTME0E).

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