Windows 10: After switching from legacy to uefi my pc brokr

I followed a youtube tutorial on how to switch from legacy to uefi. The first thing i had to do is to enter commands in command prompt after i had to go to bios to change something. The tutorial showed how he changed something but i didnt have that option. After booting my pc it was a complete black screen with a blinking cursor in top left. I tried to use a usb stick to open new windows and clicked repair and on the repair screen typed some commands in command prompt but that didnt work. I dont even had the option "continue" i just had "repair" and "shut down" can someone please help.

:)

 

I can't switch from UEFI BIOS boot to Legacy.

If you switch from BIOS UEFI to BIOS Legacy you will want to have a drive with MBR partitioning.

If you switch from BIOS Legacy to BIOS UEFI you will want to have a drive with GPT partitioning.

There are exceptions but the above are the general rules.

The ideal time to switch from UEFI to Legacy or Legacy to UEFI is during a clean install.

If you have files backed up then you can easily switch from one to other by modifying the BIOS settings.

The BIOS settings during a clean install will create the applicable drive partition architecture.

 

UEFI or Legacy?

So i went for a clean Windows 10 installation on my Aspire E13.
To boot from USB i had to switch from UEFI to Legacy, otherwise the USB drive would not be listed.

However. After the installation was finished my touchpad was not even recognized, i mean, i was not even listed in the device manager, so i read somewhere on the Acer forum that switching back to UEFI would solve this problem.
Well, i switched back to UEFI and now when the laptop start i recieve a message that says -No bootable device found!

Even if i try to use my bootable USB drive, the list is empty.
So i switched back to Legace again and guess what. Windows 10 starts like there was no problem.

So, what's the different between UEFI and Legacy? The bios tells me -Use UEFI on Win 8 and above to use all the benefits.
And why oh why can't i boot up from a existing and working Windows 10 drive using UEFI?

 

Legacy to UEFI

I'm debating moving to UEFI form my now legacy BIOS (Award Software Int.) the mother board is a GA-Z68XP-UD3 rev1.0 on the the following link it shows a UEFI BIOS U1J )UEFI BIOS)

https://www.gigabyte.com/Motherboard/GA-Z68XP-UD3-rev-10#support-dl-bios

Currently I'm running the legacy F10 BIOS. Does installing the UEFI BIOS automatically take care of everything to get to the UEFI BIOS? Installing the UEFI BIOS following the instructions using the Q-flash method https://www.gigabyte.com/webpage/20/HowToReflashBIOS.html

What's steps do I take and in what order?

Much appreciated