Connect the Galaxy S2 to a PC via USB and move both downloaded .zip files directly to the root directory of the phone’s internal storage or external SD card.
If you're having trouble finding the firmware, it might be helpful to reach out to the device's manufacturer directly or seek out communities of users for the same device. They might have more specific advice or links to where the firmware can be safely obtained. Always be cautious when downloading and installing firmware updates from sources other than the official manufacturer site. gti9100 firmware 511 download upd
: Perform a full backup using your custom recovery's "Backup" feature, as this process will wipe all data . General Installation Procedure Connect the Galaxy S2 to a PC via
was never officially released by Samsung for the classic Galaxy S2 (GT-I9100) . The manufacturer stopped official firmware support at Android 4.1.2 Jelly Bean. Enthusiasts must rely on Custom ROMs to run Android 5.1.1 on this specific hardware. Always be cautious when downloading and installing firmware
After the phone boots up (this may take longer than usual the first time), it is recommended to wipe the cache partition to prevent bugs.
Tap Reboot System . The first boot to Android 5.1.1 will take . Do not touch the phone. You will see the CyanogenMod or custom boot animation.