To avoid conflicts and ensure a clean install, wipe the following partitions:
must be and have a custom recovery like TWRP or ClockworkMod (CWM) installed. Battery: Charge to at least 80% .
In TWRP:
In the recovery menu, select Backup . This creates a complete snapshot of your current system, allowing you to restore it if anything goes wrong.
Go to product viewer dialog for this item. , famously known as the Samsung Galaxy S2 Go to product viewer dialog for this item. gti9100 firmware 511 download upd
Locate a reliable download for the Resurrection Remix or similar Lollipop-based ZIP package from developer forums like XDA or archives like SamMobile for the base stock firmware.
In the history of the GT-I9100, there was never an official global release simply called "Version 5.1.1" (Android Lollipop 5.1.1 was never officially released for the S2 by Samsung in a stable capacity for all regions). To avoid conflicts and ensure a clean install,
Install the ROM ZIP and a corresponding "GApps" (Google Apps) package to regain access to the Play Store and other Google services.
If you are looking for Android 5.1.1 (Lollipop), you will need to look for Custom ROMs (like LineageOS) rather than official Samsung Stock Firmware, as Samsung officially ended support for the S2 long before Lollipop. This creates a complete snapshot of your current