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In October, Sony confirmed that the Xperia Z3 series was eligible for the new Android Marshmallow update, but there is no word on when the roll-out process will commence.

Since the flagship Xperia Z4 (aka Z3+) and Z5 series are first in line to receive the update, it may probably take two-three months, if not more, for Sony to deploy the update to Xperia Z3 series.

If patience is not your strongest suit, then Xperia Z3 owners can enjoy Marshmallow features by installing the CyanogenMod CM13 series custom ROM.

Besides packing the goodies of Google v6.0 mobile OS, it ships with a new list of shortcuts, performance tweaks, enhancements to extend battery life and value-added features to enhance user-experience on the Motorola phone.

Also read: Google Android 6.0 Marshmallow: 7 key features you need to know

We would like to remind readers that this CyanogenMod CM13 series is an experimental version. There are some bugs in it. Users are advised to exercise caution before going ahead with the installation.

Prerequisites (Things to remember before installing the custom ROM):

  • This new Moonbreakers Android 6.0 Marshmallow custom firmware has to be installed on the Sony Xperia Z3 model; if tried on other devices, it might get bricked [To check your device model: Go to Settings >> About phone >> model number]
  • Make sure the device is rooted before going ahead with custom ROM installation. [Read More: How to Unlock Bootloader on Xperia Devices – Official Sony Video Tutorial]
  • Installation of custom ROM requires clearing of memory in the smartphone, so make sure to back all the data by installing Clockwork Mod (CWM) Recovery/ TWRP in the smartphone.
  • Make sure you have installed USB drivers on the PC, or else your smartphone (Xperia Z3) will not be recognized by the computer.
  • Make sure your device has more than 80 percent battery, or else there is a chance of smartphone getting temporarily bricked if the installation process is interrupted mid-way.

[Disclaimer: This procedure is very technical and should be performed by a person with sound knowledge of rooting (or manual software installation) Android devices. If the step-by-step installation process is not followed properly, there are chances of the smartphone getting bricked or being permanently irreparable. IBTimes, India cannot be held responsible for any damage or claims from readers if the procedure does not yield the required results or if the smartphone is bricked. Hence, users are advised to proceed with caution.]

Step-by-step installation Guide of Moonbreakers Android v5.1.1 Lollipop Custom ROM on Sony Xperia Z3:

Step 1: After Downloading CyanogenMod (unofficial) 6.0 Marshmallow custom firmware and Google Apps in to your PC and connect Sony Xperia Z3 to PC via USB chord.

[Note: scroll down to find the downloadable files]

Step 2: Place Android M custom firmware .zip file and Google Apps .zip file into the phone's internal storage. [Note: Users are advised to paste the .zip file in SD card root, not in any other folder.]

[Note: Before users' begin installing the custom software, be sure that the device must have rooted and has installed ClockworkMod Recovery tool.]

Step 3: Turn off the device and disconnect from the PC.

Step 4: Perform the regular 'Recovery Mode' sortie by press holding 'Volume (Up)', 'Home' and 'Power' buttons.

Step 5: After entering the RECOVERY mode, clear the phone memory, by choosing 'wipe data/factory reset'

[Note: use Volume keys to navigate and power button to select options, while operating under Recovery Mode]

Step 6: Clear the cache memory by selecting 'wipe cache partition'

Step 7: Return to the ClockworkMod recovery, and select 'advanced' and tap 'wipe dalvik cache' [Note: This step is optional, but many recommend this procedure so that user will not face boot loops or any other errors in the middle of custom ROM installation]

Step 8: Navigate back to the main recovery screen and then tap 'install zip from SD card'

Step 9: Tap 'choose zip from sdcard' and go to Android 5.1.1 Lollipop ROM .zip file in SD card and enter the installation process. [Note: use Volume keys to navigate and power button to select options]

Step 10: Once done with the installation process, navigate to '+++++Go Back+++++' and re-start the device by opting 'reboot system now' seen in the recovery menu.

Now, your device (Sony Xperia Z3) will take at least five minutes (only for the first time) to complete the booting process.

Users then head to device's 'Settings' option>> select 'About phone' to confirm the installation of CyanogenMod (unofficial) 6.0 Marshmallow custom firmware.

Downloadable files:

CyanogenMod (unofficial) 6.0 Marshmallow custom firmware: HERE

Google Apps: HERE

USB Driver: HERE

[Credits: Team Android]