1. Download the latest Sony PC Companion Here.
2. To run this software, your PC must meet a minimum requirements.
• Microsoft® Windows XP™ SP3 (32 bit), 
• Vista (32/64 bit),Windows 7 (32/64 bit), 
• Windows 8/8.1 (32/64 bit) or 
• Windows 10*
• At least 2 GB of RAM
• 5 GB of free hard disk space.
• Intel® Pentium® 4, 3.6 GHz or equivalent AMD processor.
• Stabil internet connection or Internet broadband connection.
• One available USB 2.0 or USB 3.0 port and USB cable.
3. Not password locked phone.
4. Best tips to flash or update Sony Xperia Z5 Dual
• Use the original USB cable that came with your device.
• Connect your device directly to the computer without USB hubs in between.
• Dont disconnect your device during the update process.
• Dont connect or disconnect any other USB device during the update process.
• Dont transfer files between the computer and other USB device during the update process.
• Dont use or move your device during the update process.
• Close any program on your computer that youre not currently using.

1. Install Sony PC Companion in your computer.
2. Then launch this program.
• Actually, From here you can update your firmware, but when you connect the Sony Xperia Z5 Dual, it must be switched on and not in security or password screen.
3. Then at the support zone click Start.

   flash Sony Xperia Z5 Dual

4. If this is the first run, PC Companion will download some files.
5. Once step 2 passed, your window will appear like this picture shown below.

   flash Sony Xperia Z5 Dual

6. On this window, select Phone / Tablet Software Update. then click Start.

   flash Sony Xperia Z5 Dual

7. On the pop up window, select repair my phone/ tablet.

   flash Sony Xperia Z5 Dual

8. If you using laptop or notebook, Connect your laptop to power supply since the update process.
9. On the next screen, give tick on "I Understand that I need to know....", then click Next

   flash Sony Xperia Z5 Dual

10. A warning window appears on screen, that say Data (Contact, Messages, Bookmarks,Calendar events, and setting) stored on Internal storage will be lost. So you must always backup all data and file. When you ready, click Continue.

    flash Sony Xperia Z5 Dual

11. On the next step, give tick the box and press Next to continue.
12. Now PC Companion is preparing.

    flash Sony Xperia Z5 Dual

13. On the next screen, give tick on "I have read and understood ...." then click Continoue.
14. Then click Next.
15. Now select phone / tablet model. you can search it on search box by type your phone model (Sony Xperia Z5 Dual).

    flash Sony Xperia Z5 Dual
16. Then click Next.
17. Following the instruction step to prepare the phone / tablet for the update.

    flash Sony Xperia Z5 Dual

• Disconnect the USB cable from your Sony Xperia Z5 Dual device and the computer.
• Turn Off your device and wait for 5 seconds.
• Connect the USB cable to the computer.
• Press and hold the volume down key on your device while connecting the USB cable.
• Wait until application automatically proceed to next step.
18. Once your Sony Xperia Z5 Dual device detected by PC Companion downloading process will start automatically. then upload the new firmware to your Sony Xperia Z5 Dual device.
19.  When PC Companion finished with update process, disconnect the Sony Xperia Z5 Dual device and switch it on.
20. Now your Sony Xperia Z5 Dual device is in factory condition, 
21. The custom data is erased and password protection is removed.
22. Congratulation, your Sony Xperia Z5 Dual firmware is update now.

Guide To Download Sony Xperia Z5 Dual Firmware.

1. Download Xperia Firmware Downloader Tool.
• XperiFirm 4.8.1 Here or Here
• XperiFirm 4.8.2 Here or Here
• XperiFirm 4.9.0 Here
2. When download finished extract and run this tool from your computer. Double click on Icon program shown below. to run this program your computer must be installed .NET framework 3.5 or above.

   Xperia Firmware Downloader Tool icon

3. Then the program will open loading windows, to checking for update, requesting log in data,  and downloading resource,

   loading window xperifirm

4. When the program fully loaded, now you can select your Sony Xperia model and version in the left navigation windows. You can select Sony Xperia Z5 Dual and then select the model (E6633 Dual).

   Download Sony Xperia Z5 Dual Firmware
5. See on the right panel window, and you will find all country and market which support your Sony Xperia devices. 
6. For an example we select market from Brazil, and we will know what is android version on the number shown at latest release (if available).

   Download Sony Xperia Z5 Dual Firmware
7. To start download this firmware you can navigate your pointer to the right above of this window, under link donate paypal you can click firmware build number shown.

   Download Sony Xperia Z5 Dual Firmware
8. Then you will see xperia firmware downloader dialogue box appear on your screen. And click Download.

   Download Sony Xperia Z5 Dual Firmware
9. This action will open a new windows browse for folder, you will be asked where will you save your firmware file on your computer. Usually directly go to desktop. But you can change to save to another folder, Once finish decide the folder you can click OK.

   Download Sony Xperia Z5 Dual Firmware
10. And download process will start now, It will take a minute or hour depending your firmware file size.

    Download Sony Xperia Z5 Dual Firmware
11. Once your download complete, you will  see the following pop message “Unpacked Successfully!” Cl ick OK.

    Unpacked Successfully xperia firmware download tool

12. The same “Unpacked successfully!” message will  appear on the download dialog. Now you can Click “Close”.

    Unpacked Successfully xperia firmware download tool

13. Now check your download location and you will  find a new folder that contains your firmware files.
14. Inside the folder download, you should find a number of files that look similar to the picture below.

    content firmware file

15. If your list of firmware files includes “fwinfo.xml” as shown below you can manually delete it before continuing to the FlashTool steps. You MUST delete this file otherwise your FTF firmware file will corrupt.

    delete fwinfo.xml file

16. Good luck and feel free to download Sony Xperia Z5 Dual Firmware.

Guide to Hard Reset Android Sony Xperia M4 Aqua Dual.

1. Make sure your computer connect to internet.
2. If possible, back up all data stored on your Sony Xperia M4 Aqua Dual
• To backup contact you can read this
• To backup your SMS, read this
3. Install PC Companion on your computer or laptop.
4. Then, Run this program, and you will see window with 3 options on screen.

   Hard Reset Android Sony Xperia M4 Aqua Dual
5. You can see the status is no phone connected, therefore you must connect yuor Sony Xperia M4 Aqua Dual to the PC or computer using USB cable.
6. Once it connected, PC companion willd detect your phone, and you should see picture shown below on your screen.

   Hard Reset Android Sony Xperia M4 Aqua Dual

7. If your phone have available update you will see this on your screen.

   Hard Reset Android Sony Xperia M4 Aqua Dual

8. If you do not want to update your Sony Xperia M4 Aqua Dual just click remind me latter.
9. Then the program will return to the main menu, now click Support Zone and click start.

   Hard Reset Android Sony Xperia M4 Aqua Dual
10. Now, Wait for the program to install the appropriate add-on.
11. On the next window, you can click "Phone / Tablet Software Update" and click start.

    Hard Reset Android Sony Xperia M4 Aqua Dual

12. Select "repair my phone / tablet".

    Hard Reset Android Sony Xperia M4 Aqua Dual

13. To continue the next step, you must tick on I understand that I need ... and then click Next.

    Hard Reset Android Sony Xperia M4 Aqua Dual

14. Now follow the instructions and accept all informations. you will be reminded the data stored in the phone memory will be lost and click Continue.

    Hard Reset Android Sony Xperia M4 Aqua Dual Dual

15. Please be patient and wait until preparing computer for software update is complete.

    Hard Reset Android Sony Xperia M4 Aqua Dual

16. Afterwards you can choose your phone / tablet model.

    Hard Reset Android Sony Xperia M4 Aqua Dual
17. Then click next.
18. Now, Disconnect Sony Xperia M4 Aqua Dual from computer.
19. Make sure the battery is fully charged or minimum you have at least 80% of battery capacity.
20. Then, Turn off the Sony Xperia M4 Aqua Dual and wait for 5 seconds.
21. Then, connect the USB cable to the computer again.
22. While press and hold the volume down button on the Sony Xperia M4 Aqua Dual.

    Hard Reset Android Sony Xperia M4 Aqua Dual
23. Now, the update of your Sony Xperia M4 Aqua Dual has started.

    Hard Reset Android Sony Xperia M4 Aqua Dual

24. Just wait until update is complete.
25. Once update finish, you can disconnect the phone from computer.
26. Now, Turn On the Sony Xperia M4 Aqua Dual. 
27. Note, that the first start of the phone after update may take a while.
28. Finish.