How to Update Sony Xperia Z3 Compact (D5803) To Official Android 5.1.1 Lollipop Firmware (23.4.A.0.546) - Page 2

6 Backup your contacts.

([Ultimate Guide] How To Backup and Restore Contacts on Android)

7. Backup your apps.

([GUIDE] How to Backup & Restore Android Apps + Data (Root Required) 

([GUIDE] How to Backup & Restore Android Apps + Data (No Root Required)

8. Backup your messages.

([Guide] How To Backup and Restore SMS on Android [No Root Required])

9. Move your photos, videos, and other personals to PC.


– Download the ROM corresponding to your Phone’s Model Number. REMEMBER to download the right one otherwise you’ll brick your phone.


1. Flashtool

2. Sony Driver Pack

3. D5803_23.4.A.0.546_Baltic.ftf



1. Install flashtool and make sure the installation directory is in C drive.

Flashtool 1

2. After installation the “Flashtool” folder will be created in the root of C drive.

flashtool 2



The “Flashtool” folder contains bunch of folders and files.

Sony Flashtool 3

– Drivers: this folder contains the drivers for your phone.

– firmwares: this folder contains a file named ‘X10_V1_BLRelock.ftf‘.

Sony Flashtool 9

– Flashtool.exe, Flashtool64.exe: this is the flashtool program that we’ll use for the update process.  Flashtool.exe is for 32-bit, and Flashtool64.exe is for 64-bit.


3. Open drivers folder and double-click on “Flashtool-drivers.exe”.

flashtool 4

4. The following window will show up:

Sony Flashtool 5

5. Make sure to check both “Flashmode Drivers” and “Fastboot Drivers” plus your phone’s driver (which is Z3 Compact in this case) then click on install and wait for the installation process to finish up.

Sony Flashtool 6

Sony Flashtool 7

Important Note:

If for some reasons your phone’s driver was not successfully installed, try to install the “Sony Driver Pack” that you downloaded above.

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Rawand Haidar

Rawand is Petroleum Engineer.He is Super high on Android. Rawand has been blogging since 2011, written more than 150 articles including tutorials, news, reviews about Android. He is interested in all things Android. Follow Me on Twitter

7 Responses

  1. Lukas says:

    high man^^
    i just got me a z3 tablet and have trouble updating it to 5.1.1. I tried many times like you write in the article but the process always fails with the error flashing system.sin. any ideas?
    a little story on what i did after I got the tablet: it came with 4.4.4 ot of the box so i thought yay, easy to root and put cm or crdroid rom on it. and that’s what i did. managed all the rooting and bootloader unlocking,.. andgot crdroid 5.1.1 on it. everything was fine just the back camera does not focus! so i wanted to install stock 5.1.1 but it fails everytime…. since i don’t want to use 4.4.4 i run without camera now…would love to try stock lolipop though
    any ideas would be greatly appreciated!
    I am new to android an learned. lot from your videos. keep it up (high), mate!

    • Rawand Haidar says:

      Hi Lukas, this error happens when there is PROBLEM in your DOWNLOADED ROM (.ftf), so I suggest downloading another ROM from another source! and also make sure to choose that rom from the firmware list inside Flashtool. let me know how it goes

      • Lukas says:

        Hey, I already tried that. I found 2 different versions on the web, both have the same problem. I even built my own ftf from the files the sony software downloads. but there was some other error….
        I thought it might be a problem that I never installeled stock lolipop before I unlocked the bootloader…but that would be silly??
        Anyways, I try to find another ftf and try again.

  2. Lukas says:

    I did! somebody posted on the xda forum that using the precious version of flashtool solved his problem. And so did it with mine….
    I just don’t understand…why does an older version flash a newer firmware?
    Anyways, now I am waiting for a root solution….haha
    thanks, bro!

    • Rawand Haidar says:

      Great! that’s really strange! btw, there is a newer version that was released last week, it’s supposedly supports older xperia devices,too although yours is pretty new but I hope it solves that STRANGE issue! Glad you found it.

  3. Richard Palmer says:

    Great step by step but I’d just be following it without actually understanding what I was doing so I had better ask first before I end up messing up my phone somehow. Does this method only work if you’re upgrading or will it let me downgrade from Marshmallow?

    I have the most recent official update but I want to downgrade to get Stamina mode and Ultra Stamina mode back.