Ensure your phone has at least 60% battery life to prevent it from shutting down mid-flash.
If your Galaxy S2 is already rooted and has a custom recovery (even an older version), you can flash the 6.0.4.5 ZIP file directly from within the current recovery. Download Cwm Recovery V6.0.4.5 For Galaxy S2 Gt I9 Action
If you plan to install , let me know so I can guide you through the wipe sequence or recommend the most stable Android KitKat / Lollipop ROMs available for the GT-I9100. Share public link Ensure your phone has at least 60% battery
Your IMEI number (device identity on cellular networks) is stored in the /efs partition. Flashing ROMs can occasionally corrupt this partition, leading to "No Service" or "Invalid IMEI." While in CWM Recovery, always check if your version supports an option. If not, use apps like "EFS Professional" on your PC before flashing major ROM updates. Share public link Your IMEI number (device identity