Keeping your Lenovo Legion Go S on the latest software matters more than most handhelds right now. This is brand-new hardware, it launched in 2025, and both Windows 11 and SteamOS builds are still maturing. Updates bring driver optimizations, better battery management, and game compatibility fixes that directly affect performance. A mid-cycle update can shave a quarter-second off game load times or fix a stutter in a game that ran rough at launch.
The update process depends entirely on which SKU you bought. Windows 11 and SteamOS use completely different mechanisms. The good news is both are straightforward once you know where to look. Here's exactly how to handle each one.
Check What Version You're Running Now
On the Windows SKU, open Settings > System > About. Look for the Windows Specification section, you want Windows 11 24H2 or newer. Below that, check the Driver section for your GPU and chipset driver versions. Legion Space also shows its build number under Settings > About.
On the SteamOS SKU, open Steam > Settings > System. The SteamOS version is listed at the top. It needs to be 3.7 or higher for official Legion Go S support, that version is what shipped with the device as a first-party platform, not a community hack. SteamOS 3.9 started rolling out in 2026 and adds broader handheld support, but 3.7 is your baseline.
Jot the version down if you run into issues later. Support will ask, and it helps when searching forums for known bugs.
Update Windows 11 SKU
The Windows side uses standard Windows Update. Go to Settings > Windows Update and click Check for updates. This pulls in OS patches, security fixes, and some driver updates through Microsoft's catalog. Let it run and restart when prompted, sometimes three or four check-restart cycles are needed if you're several updates behind.
But Windows Update doesn't catch everything on a handheld like the Legion Go S. Lenovo ships hardware-specific drivers, for the 8-inch 1920x1200 120Hz VRR display, the built-in gamepad, Wi-Fi, and audio, that go through Lenovo's own pipeline. Open Legion Space and head to Settings > Update. It scans for Lenovo-specific firmware and bios updates that Windows Update won't touch. I've seen this catch critical gamepad mapping fixes that made the difference between a game reading inputs correctly or not.
Update SteamOS SKU
SteamOS handles updates almost entirely through Steam itself. With the device booted into the Steam UI, open Settings > System. Click Check for Updates at the top. If a new version is available, it downloads and stages the install in the background.
SteamOS updates on the Legion Go S follow the same channels as the Steam Deck, stable, beta, and preview branches. Stick with stable unless you know what you're doing. The whole update process takes 5-10 minutes and includes an automatic restart. After it boots back up, you can verify the version in the same System page.
There's no separate Lenovo-specific update app on SteamOS like Legion Space on Windows. The system firmware and driver updates come bundled through the SteamOS update channel. If a hardware-specific hotfix hits from Lenovo, it gets rolled into the next SteamOS point release. This is one place where the SteamOS SKU is simpler to maintain, one update path covers everything.
Update Legion Space on the Windows SKU
Legion Space has a known issue: it's slower to launch than Steam Big Picture Mode. Part of that is the app itself, but being on an outdated build makes it worse. Lenovo pushes Legion Space updates through the Microsoft Store and through the built-in updater inside Legion Space.
Open Legion Space, go to Settings > Update, and click Check. If an update is available, it downloads and installs directly. The app may prompt a restart. For particularly stale builds, sometimes you need to grab the latest installer directly from Lenovo's support site, the in-app updater can get stuck on older versions. If Legion Space isn't showing game library entries correctly or performance profiles aren't applying, check the version first.
Update Controller and Firmware
The built-in gamepad connects internally over the device's bus, not Bluetooth, so there's no traditional pairing process. But the controller firmware still gets updated. On the Windows SKU, this is handled through Legion Space > Settings > Update, the controller firmware shows up as a separate line item. On the SteamOS SKU, controller firmware updates come packaged with system updates.
If the gamepad feels unresponsive in some games or the trigger response feels different than you remember, a controller firmware update is likely the fix. Trigger feedback varies between the Windows and SteamOS builds, and Lenovo has been tuning it post-launch. A recent patch specifically addressed trigger dead zones in shooter games on both platforms.
Fix an Update That Gets Stuck
Updates that hang mid-way are almost always a network issue. If Windows Update shows a download that hasn't budged in 20 minutes, force a restart by holding the power button for 10 seconds. That's the soft reset, it pulls the plug cleanly without corruption risk. Power back on and resume the update from the same Settings screen. Windows Update resumes from where it stopped, not from scratch.
On SteamOS, a stuck update is rarer but happens. Same fix: hold the power button 10 seconds for a hard shutdown. Boot back into Steam and the update resumes from checkpointed progress. If it keeps failing, switch Steam to offline mode (Settings > Downloads > toggle offline mode), restart, then switch back online and try again. This clears a corrupted download cache in most cases.
A router restart often clears the underlying issue regardless of OS. Unplug your router for 30 seconds, plug it back in, and wait a full 3 minutes for it to stabilize before retrying the update.
Free Up Storage Space Before the Update
Large updates need room to breathe. On the Windows SKU, big feature updates (like 24H2 to 25H2) can need 4-8GB of scratch space even if the download itself is smaller. On SteamOS, system updates typically need 2-3GB free. If you're running a 512GB model and it's nearly full, an update can fail with no clear error message.
Open Settings > Storage on either OS. On Windows, uninstall games you've finished through Settings > Apps > Installed Apps. On SteamOS, Archive (preserves saves) or Delete games from the Storage section. Aim for 10GB free minimum, that's enough headroom for any update plus game saves and cache.
If the Server Won't Respond
If the update check times out or shows an error before even starting to download, DNS is the usual suspect. On the Windows SKU, open Settings > Network & Internet > Wi-Fi > Hardware Properties and find the DNS server assignment area. Switch from automatic to manual and set Primary to 1.1.1.1 and Secondary to 1.0.0.1 (Cloudflare).
On the SteamOS SKU, open Settings > Network > Connection Properties and change DNS to manual with the same Cloudflare addresses. Public DNS servers don't have the same throttling or routing quirks that ISP resolvers do, especially during peak evening hours when everyone's downloading updates. Save the settings and try the update check again immediately.
That covers both SKUs and all the common failure points. The Legion Go S is a new device and Lenovo has been active with post-launch support. Check for updates every couple of weeks, the biggest performance gains in the first year after launch come from firmware and driver patches, not hardware revisions.
