Seeing UNDECEMBER Not Compatible With This Device on Google Play? Start by checking your phone’s Android version. LINE Games raised its minimum operating system to Android 16 in a completed patch on 28 October 2026. Phones running Android 15 or older can no longer access the live game service, even if the app installed before.
If your phone already has Android 16, check the Play Store’s compatibility result for that exact model. Hardware and regional restrictions can still affect the download. Here’s how to narrow it down.
UNDECEMBER Not Compatible: Check your OS version
Open your phone’s Settings and find About Phone, then Android Version, sometimes under Software Information. The value must say 16 or higher. If it reads 15 or below, check the manufacturer’s Software Update menu for an official Android 16 upgrade.
After updating Android, restart the phone and visit the Play Store listing for UNDECEMBER. LINE Games also announced a mandatory app update following the 30 October patch. That is distinct from the operating-system restriction introduced on October 28.
Why UNDECEMBER Not Compatible appears on Android 16
Android 16 is the first check. Google Play can also restrict installation by graphics hardware, processor, device certification or country. Use the result for your exact phone rather than assuming every Android 16 handset is eligible.
If the same Google account controls more than one phone, check which device the Play Store is offering the install for. A different handset on the account could be compatible while your current phone is not. Restarting after an OS upgrade and refreshing Play Store services can help if the compatibility label has not updated, but cannot bypass a genuine restriction.
For a persistent UNDECEMBER Not Compatible warning, do not use an unknown modified APK as a solution. The developer’s service minimum still applies after installation, and unofficial downloads can put your account at risk.
Why the old Samsung phone list is out of date
LINE Games’ old requirements page names the Galaxy S8 and S10, alongside Android 7 and Android 9. Those specifications belong to an earlier version of the game. Check the manufacturer’s upgrade support rather than using that old list to decide whether your phone will play today.
The Play Store description also displays an outdated Android 7 minimum. For UNDECEMBER Not Compatible troubleshooting, follow the publisher’s dated October 2026 patch notice rather than those legacy entries. Read our updated Android 16 compatibility guide for the timeline.
Is a compatibility warning an account ban?
No. A Google Play incompatibility notice refers to the device’s installation eligibility, not your account status. If the app opens but login fails, check network, server and sign-in conditions instead. Our mobile login guide covers those separate causes.
What if UNDECEMBER Not Compatible remains unresolved?
If your manufacturer offers no Android 16 upgrade, there is no developer-supported setting to make Android 15 meet the minimum. A compatible Windows PC provides another route through Steam or the LINE Games Launcher. The old FLOOR launcher was discontinued in September 2026.
Moving progress between mobile and PC requires more care than simply installing the game. LINE Games warns that selecting the wrong source during account linking can permanently delete the unselected account’s characters. Our cross-platform account guide explains the choice.
The UNDECEMBER Not Compatible checks should proceed in order: Android version, Google Play compatibility for the exact device, then download or login troubleshooting. That prevents wasted time changing settings unrelated to the message.
Related Guides
Official source: LINE Games’ completed Android OS update notice.
