Update Sony Xperia Z3 to eXistenZ Android 6.0.1 Marshmallow ROM

The latest Android OS version 6.0.1 Marshmallow is now available for Xperia Z3 devices. You can now upgrade your Z3 to this Android 6.0.1 with eXistenZ custom ROM. The ROM is based on official Sony Marshmallow firmware which is reported as rock solid stable. eXistenZ ROM brings various nice customization features to tweak anything as required. If you want to flash Android 6.0.1 eXistenZ custom firmware on Xperia Z3 then go ahead and follow the given instructions carefully.

Keep in mind that this ROM is not officially released by Sony. Take a complete backup of all your important data and settings first, in case anything goes wrong then you’ll be able to get your data back. Ready to get eXistenZ ROM? Follow this guide to update Xperia Z3 to Android 6.0.1 eXistenZ Marshmallow custom firmware. All you need to have a custom ROM which would require a custom recovery such as CWM in order to flash the ROM zip file on your phone.

Android 6.0.1 eXistenZ Marshmallow ROM Details:

  • Android 6.0.1 Marshmallow.
  • Based on the official Sony Marshmallow firmware.
  • Loads of great customisation features.
  • Fast and smooth.
  • Stable.


This guide containing the eXistenZ Android 6.0.1 Marshmallow custom ROM is working with the Sony Xperia Z3. Do not try to install this ROM on any other device, or your device might get bricked.


AndroidXDA.net will not be held responsible for any kind of damage occurred to your Sony Xperia Z3 during or after the installation of eXistenZ Android 6.0.1 Marshmallow Custom Firmware. Proceed at your own risk.

Before Getting Started:

  • Make sure that the battery level of your Xperia Z3 is at least about 80% before proceeding to the installation guide.
  • Download and install proper USB Drivers for the Xperia Z3 on PC.
  • It is highly recommended to take a proper back up of your important data and settings on the phone using a custom recovery such as CWM or TWRP. In case anything goes wrong then you’ll be able to restore your data.
  • Make sure that the battery level of your device is about 60% to avoid unexpected shutdowns.

Required Files:

Steps To Install Android 6.0.1 eXistenZ Marshmallow on Sony Xperia Z3:

Here we have given a step-by-step guide on how to install Android 6.0.1 Marshmallow based eXistenZ custom ROM on Xperia Z3.

Step No 1:- First, download eXistenZ Android 6.0.1 ROM for Sony Xperia Z3 to the desktop of your PC.

Step No 2:-  Unzip boot.img from the zip file separately.

Step No 3:- Plug and mount your Sony Xperia Z3 USB memory with USB data cable with your computer.

Step No 4:- Transfer Android 6.0.1 ROM zip file to the root folder of your SD card.

Step No 5:- Now, copy the boot.img file to android-sdk-windows\platform-tools directory.

Step No 6:- Power OFF your phone in order to boot into Bootloader Mode.

Step No 7:- Enter into Bootloader Mode by pressing and holding the Volume Up button while connecting it again with the USB cable. The LED of your device will turn blue. Now the phone is in Bootloader Mode.

Step No 8:- After entering to Fastboot mode on your Xperia Z3, go to android-sdk-windows\platform-tools directory on the PC and open Command Prompt.

Step No 9:- Type the following command and press Enter.

fastboot flash boot boot.img

Step 10:- Now, type this command and press Enter.

fastboot reboot

Step No 11:- Again power OFF the phone to boot into Recovery Mode. Turn the phone ON while pressing the Volume Up or Volume Down buttons a few times. Once the LED light turn pink or any other color.

Step No 12:- Go back to the main recovery menu and perform a full data wipe. This includes Dalvik cache, Cache, System, Factory data reset.

Step No 13:- Go back the main Recovery menu and choose install zip from sdcard > choose zip from sdcard.

Step No 14:- Find the ROM file that you’ve already transferred to the root folder of your SD Card in Step No 3. Select the ROM .zip file and proceed the installation process.

Step No 15:- Once the ROM is successfully installed on your Xperia Z3.

Step No 16:- After the installation of eXistenZ Android 6.0.1 Marshmallow custom ROM, select reboot system now to reboot the Z3.

It will take about 5 minutes to boots up for the first time after installing ROM on your phone.

Done! Your Xperia Z3 is updated to Android 6.0.1 eXistenZ Marshmallow custom ROM successfully.

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