HOW TO UPDATE SONY XPERIA Z2 DUAL WITH ANDROID 6.0.1 MARSHMALLOW

-Sony Xperia D6633 Android 6.0.1 Marshmallow

In this post i  will be showing you how to Update your Sony xperia Z3 duos to the latest android Os 6.0.1 Marshmallow with the following simple tricks.

First of all one important thing - before you start to do anything with your phone, do the backup of your personal data. It is only for your safety in case that something goes wrong or any mistake happens. In that case you can use the backup to restore the data and try to do everything once again. This tutorial is  been done many times to verify its propriety, so just read carefully all instructions and continue step
by step.  All important files have been stored on Google Drive, so there should be no problem with downloading. The file below has been tested ok on my phone before making out this post the referenced files are determined for Sony XPERIA Z3 Dual D6633.

Requirements:

1. A computer/Laptop running on 64Bit Os 

2. Xperia z3 Phone (D6633)

3. You need to have "flashtool-0.9.18.6-windows"installed on your system download the latest Flash tool here

4. Download android 6.0.1 Marshmallow (for D6633) Here

once you hit download above new screen will pop out demanding for an descryption key insert the follow code in the box and hit download with browser 
!0byjPyVeLRjkXI_fN0PNJ3-Aq-2mN0wEVgkcpED9yYQ

How To Installed the newest Android 6.0.1 for Sony XPERIA Z3 Dual D6633

i. Copy and Paste the ftf file(firmware) downloaded into folder „Firmware“ included in the XPERIA Flashtool
ii.Open the XPERIA Flashtool, click on flash as shown below and choose downloaded firmware, than click ok. 

Important - if you do not want to delete any data of your phone, just uncheck flashing userdata.sin file. All data will remain in your phone, but sometimes it can cause additional troubles. So it is better and highly recommended to do the backup of your personal data, than proceed with fresh installation and then restore your personal data.

iii. Turn off your phone and when Flashtool shows pop up window, connect phone to PC with holding volume down button 
iv.  After few minutes all is done and your phone gets the new firmware

feel free to let us know in the comment session if you have any difficulty.