Hi, so I paid someone to upgrade my Steam Deck to a 1TB SSD and to dual-boot Windows 11 onto the system back in September this year. During that time, the dual-boot system worked flawlessly and I was able to enjoy my games on Windows (Genshin/Star Rail) and my usual Steam games via SteamOS.

However, I didn’t use my Steam Deck for about 2 months due to starting a new job. I booted it up on Monday (20 November) to update my games and download the latest software, and today when I booted it up again, I was greeted with the “No Any Active Boot Option” screen, which was resolved by updating SteamOS to 3.5.7. However, my Steam Deck now boots into SteamOS by default, with my previous dual-boot menu completely gone.

As I’m flying abroad in a couple of hours, is there even anything I can do to get my dual-boot option back? I’m not sure if Windows 11 is still installed but there is 133GB taken up on my SSD by “Others”.