Flash CyanogenMod 9 (Android 4.0.3 ICS) On Xperia X8, X10 Mini, X10 Mini Pro

Step 1: Download the CyanogenMod 9 ROM for your device:

• X8 / W8 [XDA Thread]
• X10 Mini [XDA Thread]
• X10 Mini Pro [XDA Thread]

After the download is complete, transfer the .zip to your device’s internal storage / sdcard. Be sure to place it directly under /sdcard directory.
Step 2: Turn off your device.
Step 3: Press and hold a specific combination of buttons to boot into ClockworkMod (CWM) Recovery. Since this combination is different for different devices, you’ll have to find it yourself (hint: Google it!)
Step 4: Take a nandroid backup.
Step 5: From CWM’s main menu, wipe data/factory reset. Also be sure to wipe cache and wipe Dalvik cache from under the advanced menu.

 Step 6: Let us now flash the ROM itself. From the main menu, install zip from sdcard > choose zip from sdcard > [file you transferred to your device in Step 1]
Step 7: From main menu, reboot system now.
If you followed the steps correctly your phone should now be running CyanogenMod 9.