Phyllome OS targets x86 systems with hardware-assisted virtualization, with a strong preference for those providing IOMMU as well (AMD Vi or Intel VT-d).
*The Open Virtual Machine Firmware (OVMF), which is based on the TianoCore firmware, is the default firmware for EFI-based virtual machines. It can be accessed using the <kbd>Esc</kbd> key.*
Press the <kbd>Win</kbd> and <kbd>X</kbd> keys simultaneously to make a context menu appears. Then press <kbd>Shift</kbd> and <kbd>a</kbd> to politely ask Windows to open `Powershell` using elevated privileges, and click on the `Yes` button to bypass the User Account Control pop-up. Finally, input the following command inside the command prompt and press `enter`.
```
shutdown /fw /r
```
* **Since Windows 8**: a visual walk-through
* Open the start-up menu and write `start-up`, then select *Change advanced start-up options*
Hardware-assisted virtualization is a hit or miss on Apple computers, as there is no way to access the firmware on these computers. Apple users can jump to the section *Make sure that hardware-assisted virtualization is enabled* to check whether this feature is activated or not on their particular model.
* **Other computers**
Make sure the targeted computer is shut down.
During the POST phase, you need to press a certain key to access the firmware configuration tool for your motherboard, which is part of your BIOS or UEFI.
Just after pressing the `power-on` button, hit the right key to access the firmware configuration tool, usually <kbd>F2</kbd> or <kbd>Del</kbd>, but it depends on your model.
> Hardware manufacturers could not agree on a common keystroke to access the firmware configuration tool, so, if the given keys do not work out for you, please have a look at the documentation provided by the manufacturer of your computer.
> Failing to activate hardware-assisted virtualization will make running virtual machines extremly slow, if possible at all. If, for some reasons, it cannot be activated on your computer, you would be better off picking a Linux distribution which doesn't require it, such as [Debian](https://www.debian.org/distrib/).
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*If the activation is successful, you can go to the next section [to prepare an installation medium](https://wiki.phyllo.me/deploy/medium).*