Information: Samsung Galaxy S II (AT&T) ("i777")

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Galaxy S II (AT&T) Specifications
Codename: i777
Vendor: Samsung
Release date: 2011 October 2 (USA)
Carrier: AT&T
Type: phone
GSM freq: 850 900 1800 1900 MHz GSM/GPRS/EDGE
850 1900 2100 MHz UMTS/HSPA+
Platform: Samsung Exynos 4210
CPU: 1.2 GHz dual-core Cortex A9
GPU: Mali-400
Weight: 113 g (4.0 oz)
Dimensions: 126 mm (4.9 in) (h)
66 mm (2.6 in) (w)
9 mm (0.354 in) (d)
Screen size: 109 mm (4.3 in)
Resolution: 800x480
Screen density: 222 PPI
Internal storage: 16GB
SD Card: up to 32GB
Bluetooth: 3.0
Wi-Fi: 802.11 b/g/n
Main camera: 8MP w/ LED flash
Secondary camera: 2MP
Power: 1650 mAh
Peripherals: capacitive touchscreen, proximity & light sensors, 3-axis accelerometer, 3-axis gyroscope, digital compass, A-GPS, FM Radio, NFC
CM supported: 7, 9, 10, 10.1, 10.2, 12.1



The install guide assumes your device is running stock Android 4.x.


This device was previously called galaxys2att. Current development uses the i777 name, but older releases of CyanogenMod can still be downloaded from


Some second-generation Samsung Exynos devices are potentially susceptible to a "superbrick" caused by performing a factory reset with the stock kernel, which effectively kills the internal memory in the device. It is highly recommended you do not perform this operation while using a stock kernel for safety reasons.

Get CyanogenMod for the Galaxy S II (AT&T)

Development channel a.k.a. Nightlies, usually generated every 24 hours, experimental, newest features, unstable! Release channel a.k.a. Milestones or Snapshots, all or nearly all issues resolved, stable for daily use


How to install CyanogenMod on the Galaxy S II (AT&T)

Or build CyanogenMod yourself

Build guide

How to build CyanogenMod for the Galaxy S II (AT&T)

Source code


Additional resources

Special boot modes

  • Recovery: Vol Up & Power
  • Download: Volume Down & Power

Known Issues

To see a list of known issues, or to submit an issue, visit the Known Issues page for the Galaxy S II (AT&T).

Find help online

You may find assistance with the Galaxy S II (AT&T) on Internet Relay Chat or on the CyanogenMod forums.


The following people are maintainers for this device: atinm, Entropy512

Edit the i777 device template

This wiki has a "master" device template for adjusting settings pertaining specifically to the Galaxy S II (AT&T) (learn more). To change these master settings, edit the wiki device template at Template:device_i777.

Helpful Tip

See something wrong on this page? Click here: Report a Wiki Problem.