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For those of you looking to experience “pure” Google Android 4.2.2 without all the additives, you can try the SuperNexus ROM by Faryaab (You can follow him on Google+ here), which is exactly that. Built from Android 4.2.2 sources, SuperNexus gives you a purely “stock” Android experience, just as what you would find in a stock Nexus 4 (or Galaxy Nexus) when you buy a new phone.
Of course, it does not have all the customization and new features offered by many custom ROMs like AOKP, ParanoidAndroid, or CM10.1 but it does give you stability of stock Android and also 100% stock features. (e.g. Long-press wifi/bluetooth in quick toggles will turn on/off your wifi/bluetooth, a stock Android 4.2.2 feature, some custom ROMs don’t have it.)
Also, you can experience stable battery life as there’s less things that can go wrong with SuperNexus ROM and in return you get stability in battery life also.
So, if you want to experience stock Android 4.2.2 and turn your phone into a Nexus 4, give SuperNexus ROM a go, I am sure you will like it (as many users have also reported in past with previous version of SuperNexus). And do let me know how the performance/battery life on this ROM works for your phone!
Download SuperNexus Android 4.2.2 ROM for Galaxy S2 GT-i9100
To install, reboot into recovery, wipe data/factory reset (most likely needed, backup ROM and backup apps beforehand!!!!), install ROM, reboot.
Once after booting successfully, reboot into recovery and flash Gapps.
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You will need a rooted Galaxy S2 to install all ROM/kernels.
NOTE: PLEASE ONLY INSTALL ROMS INTENDED FOR YOUR VERSION OF Galaxy S2! Otherwise you WILL BRICK YOUR PHONE and I will not be responsible!
First time to rooting and custom ROMs?
Please see our FAQ for your Galaxy S2 model FIRST!!!:
Galaxy S2 GT-i9100 FAQ
Galaxy S2 SGH-i777 (AT&T) FAQ
Galaxy S2 SGH-T989 (T-mobile) FAQ
Galaxy S2 SPH-D710 (Sprint) FAQ
Galaxy S2 ROMs
Galaxy S2 GT-i9100 ROMs
Galaxy S2 SGH-i777 AT&T ROMs
Galaxy S2 SGH-T9989 T-Mobile ROMs
Galaxy S2 SPH-D710 Sprint ROMs