Problems installing Windows drivers

[ERAK]

Hello,
I installed Windows on the SD-Card while Steam-Os is still on the SSD.
The Windows install worked fine but I have problems installing the APU und Audio drivers.
When I install the AMD APU driver the AMD software start and looks for the driver and after that it starts downloading the driver, but halfway through it restarts the Steam Deck and therefor automatically boots into Steam-OS. After I turn off the Steam Deck and boot windows on the SD-Card again the APU driver isn't installed and the AMD software isn't installed either.

For the audio drivers there is no "install" option when I right click on the cs35l41.inf or the NAU88L21.inf, I am only able to open them but not able to install them.

[Boblin the Goblin]

Because the default boot option is Steam OS.

I don't know if you can change the boot order to look at the SD card first.

[CodeHacker]

to install a .inf file, you must right click the file and look for Install, it may be under more options.

[PopinFRESH]

You need to install them in order as outlined on the Steam Deck - Windows Resources page.

https://help.steampowered.com/en/faqs/view/6121-ECCD-D643-BAA8

Install the APU drivers via the setup.exe
When prompted to reboot it should have the option to reboot later. Then you can shutdown and then boot by pressing and holding Vol - and then pressing the power button to boot to the boot manager. Then select your Windows installation to finish booting to that which should complete the APU driver installation

Then for the audio drivers you need to install the cs35l41.inf first and then install the NAU88L21.inf after that.

If your on Windows 10 you should just be able to right click and select Install.
If you on Windows 11 you will need to right click, select Show More Options, and then select Install.

Audio drivers
Download driver 1/2, right click cs35l41.inf and select Install. (last updated June 13, 2022)
Download driver 2/2, right click NAU88L21.inf and select Install.
These INF files will show up as 'Setup Information' type files in File Explorer.
On Windows 11, right click and select 'Show More Options' to see the 'Install' option.
Don't forget to get the updated APU driver above for audio support.

EDIT:

Also to note, the method you're trying to install Windows is not currently supported, as noted on the same Steam Deck - Windows Resources page as above.

There are several videos on YouTube however where people go through the process of setting up "dual boot" in a few different options, including installing Windows on your microSD card like you've done. Some of those also go into "hacking" the boot loader in order to boot directly to Windows but that isn't needed if you use the Vol - and then power button to boot to the boot manager and then select which boot option you want to load.