Update Xperia Miro ST23i/ST23a to Android 4.4.2 Kitkat firmware via CM11 ROM

Xperia Miro ST23i/ST23a is one of the best mid range android Smartphones launched by the Sony. It runs on Android 4.0.4 ICS out of the box and had not yet received any Jelly Bean or Kitkat update, and there is no change for it to receive any Android updates in future. So in order to update Xperia Miro ST23i/ST23a we must depend on Custom ROM’s. In this guide we have brought one such Custom ROM which will update Xperia Miro ST23i/ST23a to Android 4.4.2 Kitkat and is called CM 11 ROM.

Update Xperia Miro ST23i/ST23a to Android 4.4.2 Kitkat So if you are owner or user of this device then you can install this ROM on your Xperia Miro ST23i/ST23a device and enjoy Android 4.4.2 Kitkat. CM 11 ROM is based on Android 4.4.2 Kitkat firmware and packs lot of features of its own like speed and smoothness, security enhancements etc. Before we proceed to Update Xperia Miro ST23i/ST23a to Android 4.4.2 Kitkat we must follow some set of instructions called pre requisites, to prepare Xperia Miro ST23i/ST23a for the installation process and also to avoid it from bricking during installation process.

Pre Requisites:

  • Make sure your device is Xperia Miro ST23i/ST23a.
  • Backup all of your data to a safe location, as we are going to install the Custom ROM which will erase all of the data on the device.
  • Charge your device to at least 75%, to avoid it from shutting down in between the rooting process, if happened this may brick your device.
  • Make sure USB Debugging is enabled on your device. Check in Settings > Developer Options > USB Debugging.
  • Download and install USB drivers suitable for your device from here.
  • Setup ADB and Fastboot drivers on your PC from here.
  • Backup TA partition. Follow here.
  • Unlock Bootloader on your device from here.
  • Root Xperia Miro ST23i/ST23a from here.


We should not be held liable or responsible in any manner for any damage occurred to your Xperia Miro ST23i/ST23a device. So understand the risk involved and proceed further at your own risk.

Guide to update Miro ST23i/ST23a to Android 4.4.2 Kitkat using CM 11 ROM

#1. Download CM 11 Android 4.4.2 ROM Package from here to your PC.

#2. Download Google Apps Package from here to your PC. [Mirror]

#3. Extract the ROM zip on PC and copy the boot.img file from it, to the Fastboot folder.

#4. Now copy the full ROM.zip file and Google Apps Package to the Root of your device’s SD card. Power off your device.

#5. Enter into Fastboot mode. To do so connect the USB cable to PC and hold Volume Up in your device and connect it to PC. Now the LED will turn blue.

# 6: Open Command Prompt inside Fastboot folder in PC. To do so open Fastboot folder in PC and press and hold Shift Key and right click anywhere inside the Fastboot folder in the empty space. Now from the list click on open command window here.

#7: Now in CMD type: fastboot flash boot boot.img and press enter.

#8: Now it will flash boot.img on your device. Now type: fastboot reboot and press enter.

#9: Now when your device is booting up, press power button or volume up/down to enter into recovery mode.

#10: Now in recovery mode, select “Install zip from SD card” and choose the CM 11 ROM package which you have copied on your device’s SD card and install it.

#11: Now again follow the above step, but this time choose Google Apps Package and install it.

#12: Once done Go Back and select “reboot system now”, this will boot your device into normal mode.

Note: The first boot may take some time, so please be patience and wait for it to boot up successfully. If at all your device gets into boot loop sequence then you have to remove battery and reinsert it and clear all the data and wipe cache and dalvik cache and boot your device. If this doesn’t solve then follow the above procedure again.

#13: Once the device boots up you are ready to experience the Android 4.4.2 Kitkat on your Xperia Miro ST23i/ST23a device.

  • Kevin

    I think you need to change the order in the Pre Requisites: First you need to
    Backup TA partition. How? Follow here.

    and then
    Unlock Bootloader on your device from here.

    • Thank you for informing us…

  • Roland

    Recovery mode after fastboot reboot is not popping in. Tried all the button possibilities, none works.

    • Try issuing “fastboot boot recovery” command. This will boot your device into Recovery Mode..Hope it worked!!

      • Roland

        I get “cannot load recovery.”

        • follow this thread and you will be able to boot into CWM Recovery mode – follow here.

          • Roland

            The problem is that the phone doesn’t want to communicate with the computer, the only way to make it work is the fastboot, but CWM is waiting for the device on install. Is it possible somehow to rollback the changes that the boot.img made ?

          • Sorry to say but you can’t roll back the boot.img installation. Instead you have to flash the stock ROM back. Try searching for the stock ROM in Google hope you will find it. BTW i’m not much clear about your problem can you describe it briefly, may be i can help you. What are you actually trying to do, are you willing to install the CM11 ROM or ?

          • Make sure you have installed the USB Drivers for your device. If not then your device won’t communicate with your device. So install the USB Drivers from the pre requisites section of this post.

          • Roland

            So, originally i wanted to install CW 11, the communication was perfect till the boot.img, after that, the phone doesn’t want to communicate, i can’t see the internal or external storage since then. It’s like it became invisible. The phone is not booting up, doesn’t even gets to the Sony logo, only the leds are working.

            As it is not working, right now i would be fine i could just change back the system to the default state.

          • So you have bricked your device…don’t worry revert back to stock firmware from here

          • Roland


  • Roland

    Downloading it right now, never though it is so easy to brick, but well, at least i learned something today. Thank your for your help, will write if i had succeeded.

    • Waiting for your reply..

  • Kevin

    Having same problem here. Also after flashging boot.img no way to enter recovery mode on my xperia. hope recovery to stock firmware will work. Also downloading for the moment.

  • Roland

    It’s back, reverting fixed it. I think these kind of upgrades are not for the my kind of person. Thank you for help.

  • Kevin

    the recovery to firmware worked fine for me, thanks a lot, no it’s figuring out what went wrong while flashing boot.img

  • Robin

    The update went through but then I found that my wifi will not turn on.
    is there a fix or something i need to do?

  • Robin

    No problems with the updare procedure.

    But my Wifi will not turn on.

    is this a known bug? or is there a fix for it?

  • Michael

    Theres a little bit problem, After I installed the ROM, and it works totaly just fine but minutes laters I figured out the the back button and there is no keypad…

  • Rahul

    Xperia miro ST23i

    I flash boot.img
    then fastboot reboot
    BUT LOGO was scribbled……(not the main issue)
    i did factory reset…
    IT SHOWS error ” unknow volume sd-ext”
    Then install zip………….adb sideload
    it shows “failed to write data ‘protocol fault(status len)

    then i repeated the same with boot.img from cm10_mesona.zip
    NO error

    what can b d problem

  • Razjel

    I have problem with installing apps packages. When i try i get this error:
    E:Error in /storage/sdcard1/gapps-kk-20140105-signed.zip (Status 7)
    What does it mean? And when i Start android my WiFi doesn’t work…
    Please help me guys :)

    • oeo

      after finish with install make wipes/ case dalvink … just works for me!!

  • Brian Chiang

    erm…same problem with Robin…wifi unable to ON…can i change it to CM10.2 instead? and how to change to CM10.2 if can…?

  • atiq

    how to revert back to official stock ROM? plz help

    • Search for Xperia Miro Stock firmwares on Google and you will find them and flash them on your device and flash them using Flashtool.

  • atiq

    please give me correct link to download stock firmware, i’m searching but every website is playing a game. please help me

    • Here is the link to the Stock Firmware for Xperia Miro. It from XDA and its is 100% trustworthy site.

  • Robert Varghese

    Is Camera working in this rom…?

  • Jizzy

    In the beginning Wi-Fi was bugged. But after \factory reset\ Wi-Fi worked. Camera makes a mess. Have a question.. Please, is possible make overclocking ? And how.. some nice tutorial like this. Cause Miro is pretty slow and CPU still working almost on 100%…

  • Mohan

    after flashing the rom zip,cyanogen mod logo shows up but does not proceed,it keeps circling aand circling.What should i do?