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Is there anything I would still need a windows dual boot for?
(sh.itjust.works)
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Helping friends and family troubleshoot is something I would still have to do. I always assumed that I would be able to fix any mistakes quickly enough with a live boot usb but having a working windows install to fall back on is a good idea.
Also, you can flash BIOS via an OS? I thought it could only be done from within the BIOS?
I have never had to manually flash a BIOS. Usually when I’ve seen it done, some program was executed in Windows that would prepare the flashing, then the computer would restart and flash the BIOS before restarting again.
I think what you saw was the usb getting flashed (like how you make an installable drive), rebooting to bios and flashing the bios from the usb. That's how I did it anyway.
Possible. I’m not proficient in the firmware realm. But since there was no external drive attached, that “installable drive” would have to have lived on the main drive.