added firmware toggle for Windows Profiles

Author: sus-admin

_posts/2025-04-14-Cobbler-v3.3.7-Windows-Deployment-Guide.md

@@ -139,6 +139,14 @@ mount -o ro,loop ~/Downloads/Win10_22H2_English_x64.iso /mnt/Windows10
 cobbler import --name Win10 --path /mnt/Windows10
 ```
 
+**If** the PXE client will use legacy-BIOS firmware *(MBR partition scheme)* instead of UEFI, toggle `uefi` to `false` in the Cobbler Distro autoinstallation metadata:
+
+```shell
+cobbler profile edit --name Win10-x86_64 --autoinstall-meta 'uefi'='false' --in-place
+```
+
+> More info in Cobbler's [official docs](https://cobbler.readthedocs.io/en/v3.3.7/user-guide/wingen.html).
+
 Finally, create a new Cobbler System to PXE boot and automatically install Windows 10 Pro, replacing the *"aa:bb:cc:dd:ee:ff"* with the MAC address of your PXE client, being sure not to use a duplicate MAC or IP addresse of any other Cobbler System, then sync up Cobbler.
 
 ```shell