Warning: The Samsung Galaxy S II is no longer maintained. A build guide is available for developers that would like to make private builds, or even restart official support.
Special boot modes
Recovery: With the device powered off, hold Volume Up + Home + Power.
Bootloader/Fastboot/Download: With the device powered off, hold Volume Down + Home + Power.
Find help online
Note: This page is auto-generated for the Samsung Galaxy S II, based on the device’s information, located here. You can find similar instructions for every officially-supported device on this wiki.