Normally you can flash and then use only one ROM/firmware on your Android phone unless some specific tool (a multi-boot kernel) is used to enable the option to boot multiple ROMs on the device. If you happen to have the Samsung Galaxy SII then a free app called LolBoot can be used to achieve this multi-boot functionality. More specifically, LolBoot will allow to dual-boot two completely independent ROMs on your SGS2 device. One firmware will be the primary one that will be booted normally. However, if the use recovery button combo (VOL-UP+HOME+POWER) then your Galaxy SII will boot in to the secondary flashed ROM instead of going to recovery menu. Please note that this tool requires a root on your Samsung device and is still in experimental stage. As a result it may not be compatible with all the available ROMs. You can find more details at the http://lui.li/lolboot-xda – the original XDA forum thread.
In case your Samsung Galaxy SII is not rooted then follow the guide: Root Samsung Galaxy SII (S2) Using Odin and CF-Root Insecure Kernels to do so. A detailed demo of the LolBoot is embedded below:
You might also be interested to have a look at the Samsung Galaxy S II section on our website where we have covered a large collection of tweaks, tips&tricks and rooting and custom ROM installation guides for the Samsung Galaxy S2 (SII).
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