iirc, the android system is installed on the internal memory, right ?
@mukul
[DEVELOPMENT][ROM] [MINI PRO/MINI/ACTIVE/LWW] MiniCMSandwich AOSP Android 4.0.4 RC3 - xda-developers
{Mini/MiniPro/Active/Live}[DEVELOPMENT] -FXP115- CM7.2.0 - FreeXperia Project - xda-developers
{Mini/MiniPro/Active/Live}[DEVELOPMENT] -FXP115- CM9.0 - FreeXperia Project - xda-developers
If you're bored of stock, that is
I would wait for an update rather than messing up my phone!
I'm just one day old on using Android! 
@mukul
[DEVELOPMENT][ROM] [MINI PRO/MINI/ACTIVE/LWW] MiniCMSandwich AOSP Android 4.0.4 RC3 - xda-developers
{Mini/MiniPro/Active/Live}[DEVELOPMENT] -FXP115- CM7.2.0 - FreeXperia Project - xda-developers
{Mini/MiniPro/Active/Live}[DEVELOPMENT] -FXP115- CM9.0 - FreeXperia Project - xda-developers
If you're bored of stock, that is
I would wait for an update rather than messing up my phone!