Once both installations are complete, go back to the main menu and select Reboot System Now . Note: The first boot may take 5–10 minutes. Troubleshooting & Tips
Custom ROMs for the GT-I9100 are community-maintained. Visit the XDA Developers Galaxy S II forum for the latest custom software.
CyanogenMod 12.1 (Android 5.1.1) for i9100: Search for the final "Stable" or "Snapshot" builds on XDA Developers or reputable ROM archives. gti9100 firmware 511 download upd
: Charge your device to at least 80% to prevent it from shutting down mid-process.
Once the ROM is finished, go back to Install and select the GApps .zip file. This ensures you have the Play Store and Google services. Once both installations are complete, go back to
Ultimate Guide to GT-I9100 Firmware 5.1.1 Download and Update
To install these updates, users typically use Odin 3 , a leaked internal Samsung tool for flashing firmware, recoveries, and bootloaders. Prerequisites for Downloading and Updating Visit the XDA Developers Galaxy S II forum
For a stable Android 5.1.1 experience on GT-I9100, look for:
Select , followed by Choose zip from sdcard .
Before downloading any files, you must verify your exact device model.
Samsung Galaxy S2 (GT-I9100) Android 5.1.1 Lollipop Firmware Update Guide
