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Download Galaxy S2 Marshmallow Update: CM13 and other ROMS
[Download] AT&T and T-Mobile Galaxy S2 CM13 Marshmallow ROM
How To Factory Reset or Hard Reset Samsung Galaxy S2
Back to Stock: Downgrade AT&T Galaxy S2 Skyrocket SGH-I727 to Android 4.1.2 Jelly Bean with Official Firmware
Back to Stock: Downgrade AT&T Galaxy S2 SGH-I777 to Android 4.1.2 Jelly Bean with Official Firmware
AT&T Galaxy S2 SGH-I777 Android 4.4.2 Update Now Available via SuperNexus ROM
Update AT&T Galaxy S2 to Jelly Bean With SuperNexus ROM, based on Android 4.1
F1 GalaxyNexus AOSP Android 4.0.4 ROM Available on AT&T Galaxy S2 SGH-i777
UCLC2 — Update AT&T Galaxy S2 to Ice Cream Sandwich (ICS) with Leaked Samsung Firmware
Install Ice Cream Sandwich Themed Criskelo Rom on AT&T Galaxy S2 SGH-i777
How to Install HydrOxyG3NMOD (Oxygen) Rom on AT&T Galaxy S2
Install Overclocked ROM (with Bravia Engine) on AT&T Galaxy S2 Skyrocket
Install Ice Cream Sandwich Themed Android 2.3.6 ROM on the AT&T Galaxy S2
Cyanogenmod 7 (CM7) for the AT&T Galaxy S II Skyrocket (SGH-I727)
CWM flashable Modems for AT&T Galaxy S2 (Stock, MIUI and CM7)
AT&T Galaxy S II Priced at $199, Releases On October 2