Anyone with on XDA will have undoubtedly gone through quite a few different ROMs in their respective devices. More often than not, this is partially due to us never being completely happy with a single one. It could be because the theme doesn’t necessarily appeal to us, or maybe a you need to use a ROM due to a certain feature, such as EPST on Sense ROMs. For this purpose, there is always the option of dual booting (assuming that your device can do it) What if you could just switch back and forth ROMs easily on your Xperia Play? Lets say that you are torn between rooted stock and AOSP but you really cannot make up your mind on which one to use daily. Well, thanks to the efforts of XDA member KeiranFTW, you now have the ability to switch between two ROMs at your leisure. The dev has prepared a specialty kernel that will allow the device to have the option to dual boot from SD card.
The installation process is neatly laid out for anyone who can read and understand ADB commands, so missing out a step is really not an option unless you are not paying attention. As an added bonus, it seems that the EXT2 image that must be used after partitioning the SD card will give your device a nice I/O boost, which can be seen in Quadrant scores. All files, instructions, and requirements are in the OP, so please read it carefully.
If you have any feedback or suggestions for the dev, please make sure that you leave them on the thread.
How to dualboot:
What you will need:
An SD Card
7zip or alternative(Archive manager on linux is good)
Notepad++(gedit is good)
You can find more information in the kernel thread.
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Thanks Leraeniesh for the tip!___________________