Yoshiba satellite L50-B905 no bootable device and can't log into bios

[Sajaa]

Hey,
I was trying to downgrade from windows 8.1 to windows 7, so i follow instruction on a youtube video which is changing
Secure boot = Disableed,
Virtualization Technology = Disabled,
Boot mode = CSM boot,
Function key mode = standard F1 - F12 mode
now when i start my laptop i get " no bootable device " and when i can't enter the bios " i've tryed F2, F10, F12, Delete, and Esc "
Any idea how can i fix it?
thank you

 

[Laptop_Nerd]

Hi,

Please do reset BIOS by removing the CMOS battery off the laptop for couple of seconds while it's completely off, battery out and AC adapter disconnected. Once done, put everything back together and that should have reset BIOS to its default.

Here's video on how to disassemble the laptop.
https/www.youtube.com/watch?v=YatNrUHN3c4