What is the safest way to flash the BIOS? Is Safe Mode better?
The safer way to upgrade a BIOS is doing the upgrade under DOS
enviroment. That is because the nature of the operative system itself
(it doesn't has any protection).
If you want to flash bios under Windows:
restart your computer (do not put your computer to sleep after restart)
disable any antimalware software
close all opened windows
plug in AC Adapter as power supply during the update process
do not to turn off the computer during the process
read the informations and readme.txt file that is available with every BIOS download before flashing bios.
When the update finishes, the computer will
automatically reboot for the changes to take effect.
Note: You can also try to flash under Safe Mode, but it is not recommended because Windows disables all services. You don't know if the BIOS update package needs any one of them.
Example: Some, like the S10-3 BIOS say that you need to right click and run as an administrator. If you don't, some actually seem to contain and unpack multiple files and if you apply the wrong one, you can hang your system.