How to fix Steam Deck freezing or black screen

1. Enable Developer Mode:
   Steam > Settings > System > Enable Developer Mode
2. Go to Developer tab > Toggle Show Advanced Update Channels
3. In Settings > System, set OS Update Channel to “Main”
4. Click Apply under Software Updates
5. Let Deck restart fully — this could take 15 minutes and the screen might appear dead. Don’t interrupt it.
6. Once booted, unplug the external monitor and see if internal screen is back.

At this point, my Steam Deck updated to BIOS F7A0131, but the screen remained black. What ultimately fixed it was forcing the firmware repair again after the BIOS update.

1. Power off fully — hold power for 15 full seconds even after screen goes black.
2. Unplug external monitor.
3. Press and hold Volume (-) + QAM (“…”)
4. Tap Power once while holding both buttons.
5. Release when white LED starts blinking or you hear a chime (I didn’t hear a chime, but it still worked).
6. Wait up to 15 minutes.

It was tempting to mess with it during this stage as it felt like a lifetime, and my Steam Deck actually restarted itself 3 times during the process and seemed stuck, but it worked. Patience was key!