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Add information on how to update firmware. Merge pr-1437

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@ -149,5 +149,57 @@ Which one to use depends on the device whose firmware is being updated.
tool to update the firmware.
Firmware updates are important on all systems, but they are especially
important on AMD client systems. These doesn't support loading microcode from
important on AMD client systems. These do not support loading microcode from
the OS, so firmware updates are the **only** way to obtain microcode updates.
## Firmware updates
As of Qubes 4.2, firmware updates can be performed from within Qubes for [fwupd-supported computers](https://fwupd.org/).
### In dom0
First, ensure that your [UpdateVM](/doc/Software/UpdateVM/)
contains the `fwupd-qubes-vm` package. This package is installed
by default for qubes with `qubes-vm-recommended` packages.
In a dom0 terminal, install the `fwupd-qubes-dom0` package:
```
$ sudo qubes-dom0-update fwupd-qubes-dom0
```
Once the package is installed:
```
$ sudo qubes-fwupdmgr get-devices
```
Examine the terminal output for warnings or errors.
You may see the following warning:
```
WARNING: UEFI capsule updates not available or enabled
```
If so, [adjust your BIOS settings](https://github.com/fwupd/fwupd/wiki/PluginFlag:capsules-unsupported) to enable UEFI updates. This setting is sometimes named "Windows UEFI Firmware Update."
Once resolved, in a dom0 terminal:
```
$ sudo qubes-fwupdmgr get-devices
$ sudo qubes-fwupdmgr refresh
$ sudo qubes-fwupdmgr update
```
A numbered list of devices with available updates will be presented. Ensure your computer is plugged in to a stable power source, then type the list number of the device you wish to update. If a reboot is required, you will be prompted at the console to confirm.
Repeat the update process for any additional devices on your computer.
### In other qubes
Devices that are attached to non-dom0 qubes can be updated via a graphical tool for `fwupd`, or via the `fwupdmgr` commandline tool.
To update the firmware of offline qubes, use the [Updates
proxy](/doc/how-to/install/software/#updates-proxy).
### Computers without fwupd support
For computers that do not have firmware update support via `fwupd`, follow the firmware update instructions on the manufacturer's website. Verify the authenticity of any firmware updates you apply.