Update Xperia Z C6603 to Asylum Omni Android 4.4.2 Kit-Kat Custom ROM


Sony Xperia Z users can enjoy almost all the Features of Android 4.4.2 through Asylum Omni ROM, the developer has done a great job in keeping the interface Stock, also kept some of the bloatware in the ROM, so that you won’t feel a little weird using it. Even the battery life is already good of Xperia Devices, yet developer has ported some battery mods in it as well to make battery life even better. Some under the hood tweaks are there to make this ROM fast and smooth, Drak UI is there to save battery, Halo is ported for floating windows, quick settings, RAM bar and many more things are there for you to explore. If you are interested in Other ROMs, you can Visit our Custom ROMs section or you can install this ROM on your Sony Xperia Z by following our tutorial below. This is not an official release from Sony, but a Custom ROM, you need to install a Custom Recovery on your device to install this and also your device must be rooted.


But why would anyone go for a Custom ROM instead of staying on the Stock On, allow me to explain… “Stock and Official ROMs are good, but they are created with keeping in mind the demands of all, some want performance and some wants speed, some want looks, some want features. Putting them all in one ROM can cause a Lag, Performance issues and bugs. But Custom ROM is basically designed for either Looks or Performance.  Custom ROM gives speed and great performance with Tweaks and System Tools.”

In this Article,  we will show you How To Install Asylum Omni Android 4.4.2 Kit-Kat On Xperia Z C6603. But before we begin, Make sure:

  1. That you have a Well Charged Battery, 60%-80% is better.
  2. Back-Up all your important ContactsCall Logs & Messages. It is highly recommended in case of any mishap or data loss to back up all your important data.
  3. Back-Up your Mobiles EFS Data.
  4. Check your device model, Go To Setting > About and Make sure that it is C6603.
  5. Do-not try it on C6602
  6. Enable USB Debugging Mode
  7. Download USB Driver For Nexus Devices: Link
  8. Bootloader Must Be Unlocked: Unlock Bootloader Of Xperia Devices
  9. Root Your Device: Root Sony Xperia Z


The methods involved in flashing custom roms and rooting your phone is highly custom and may result in bricking your device,and has nothing to do with Google or the device manufacturers which is Sony in our case. In case of any mishap we may not be held responsible. Follow these instructions to the letter to avoid any mishap or bricking. Make sure that whatever you do, you are doing it at your own responsibility


Here you will find the Step-by-Step Guide On How To Install Asylum Omni On Sony Xperia Z. But let me remind you again ClockworkMod Recovery(Older Version) is not recommended when it comes to installing this ROM, Only latest versions of TWRP and CWM Touch Recovery for the Device is supported without bugs. So, if you are using an Old CWM Recovery or TWRP on your device Upgrade it to the Latest version, if you want to go with older version, you are on your own. We are warning you that if you used an Older Recovery and Brick your device, We will not be responsible for anything.

Downloads Required:

  1. Download Android 4.4.2  Asylum Omni ROM: Link
  2. Download Google Apps: Link

How To Install It

  • Connect your device with PC.
  • Copy and Paste the Above zip files to the root of your sdcard.
  • Disconnect the cable.
  • Turn Off your Device
  • Open Recovery mode. How? Press and hold Volume Up + Volume Down+ Power buttons until you see some text on screen.

CWM/PhilZ Touch Recovery Users.

  • First Choose ‘Wipe Cache’.


  • Then Navigate to ‘advance’ and choose ‘Devlik Wipe Cache’ so you won’t get in any bootloop.


  • Then Finally Choose Wipe Data/Factory Reset.


  • Navigate to ‘Install zip from sd card’ another windows will open in front of you.


  • Select ‘choose zip from sd card’ from the Options.


  • Select the Asylum Omni.zip file and confirm the installation on next screen.
  • Once the Installation is Over, Go back and Flash Google Apps
  • Once the Installation is Over, Select +++++Go Back+++++
  • Select Reboot Now to Reboot the System.


TWRP Users.

TWRP- (1)

  • Tap on Wipe Button and Select Cache, System, Data.
  • Swipe the Confirmation Slider.
  • Go back to Main Menu and Tap Install Button.
  • Locate the Asylum Omni.zip and Google Apps , Swipe the Slider To install it.
  • Once the Installation is Over, you will promoted to Reboot System Now
  • Select Reboot Now to Reboot the System.

Solve Signature Verification Error:

  • Open Recovery.
  • Navigate to install zip from Sdcard


  • Navigate to Toggle Signature Verification and Press Power Button and See if it is disabled or not. Disable it and then Install the Zip without any Error.


That’s it, After a Successful reboot, your Sony Xperia Z will be running Android 4.4.2 Asylum Omni Kit-KatWait for At-least 5-minutes for the First run, then go to Settings > About to Verify.